Building the First SPFx Lab Web Part in 2026

Let start by building the first web part, and the best choice is a simple baseline web part inside your new SPFx lab project. That fits the structure we already defined in your study plan and keeps the first step small, stable, and reusable. The 100-part roadmap is much easier to sustain when the first component becomes a clean baseline rather than an overly ambitious business component on day one. The proposed structure of the 10 themed solutions is already a strong foundation for that lab approach .

According to Microsoft Learn, SPFx remains the recommended extensibility model for modern SharePoint, and the current setup guidance now distinguishes the newer Heft-based toolchain for SPFx v1.22+ from the legacy gulp-based setup. Microsoft also continues to position SPFx as the primary replacement path for SharePoint add-ins, and the roadmap remains active for newer releases. (Microsoft Learn)

Why the first web part should be simple

For your catch-up project, the first web part should not try to solve a real business scenario yet. It should prove that your environment, generator, React structure, property pane, theming, and Fluent UI usage are all working correctly. Microsoft’s Fluent UI guidance for SPFx also recommends using the Fluent UI package version included by the generator and avoiding unsupported styling patterns that can create conflicts. (Microsoft Learn)

So the correct first target is this:

Web Part 01: LabHelloWorld

This first web part should include:

• a title
• a short description
• a property pane text field
• one Fluent UI button
• one small state update
• scoped styling only

That gives you a baseline that is simple enough to validate quickly and strong enough to serve as the starting point for the next web parts.

Recommended project structure

Based on the learning structure we defined earlier, I would start your first solution like this :

spfx-lab-01-fundamentals/
  src/
    webparts/
      labHelloWorld/
        LabHelloWorldWebPart.ts
        components/
          ILabHelloWorldProps.ts
          LabHelloWorld.tsx
          LabHelloWorld.module.scss

Step-by-step implementation

1. Create the solution

Use the latest official SPFx environment guidance from Microsoft Learn before scaffolding the project, especially because newer versions use the updated setup model and distinguish newer toolchain expectations from the legacy flow. (Microsoft Learn)

Create a new solution dedicated only to your lab:

yo @microsoft/sharepoint

Use a naming pattern like this:

• Solution name: spfx-lab-01-fundamentals
• Web part name: LabHelloWorld
• Framework: React

2. Define the props interface

Create ILabHelloWorldProps.ts:

export interface ILabHelloWorldProps {
  description: string;
}

3. Build the React component

Create LabHelloWorld.tsx:

import * as React from 'react';
import styles from './LabHelloWorld.module.scss';
import type { ILabHelloWorldProps } from './ILabHelloWorldProps';
import { DefaultButton } from '@fluentui/react/lib/Button';
const LabHelloWorld: React.FC<ILabHelloWorldProps> = (props) => {
  const [clickCount, setClickCount] = React.useState<number>(0);
  const handleClick = (): void => {
    setClickCount((current) => current + 1);
  };
  return (
    <section className={styles.labHelloWorld}>
      <div className={styles.container}>
        <h2 className={styles.title}>SPFx Lab 2026</h2>
        <p className={styles.description}>{props.description}</p>
        <div className={styles.panel}>
          <p className={styles.counterLabel}>Button clicks: {clickCount}</p>
          <DefaultButton text="Click me" onClick={handleClick} />
        </div>
      </div>
    </section>
  );
};
export default LabHelloWorld;

4. Add scoped styles

Create LabHelloWorld.module.scss:

.labHelloWorld {
  padding: 20px;
}
.container {
  border: 1px solid #edebe9;
  border-radius: 8px;
  padding: 20px;
  background-color: #ffffff;
}
.title {
  font-size: 24px;
  font-weight: 600;
  margin: 0 0 12px 0;
}
.description {
  font-size: 14px;
  margin: 0 0 16px 0;
  color: #323130;
}
.panel {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.counterLabel {
  font-size: 14px;
  margin: 0;
}

This follows the safer direction for SPFx styling: keep styles local and predictable instead of relying on global CSS behavior, which Microsoft warns can become problematic in SharePoint-hosted experiences. (Microsoft Learn)

5. Wire the web part class

Update LabHelloWorldWebPart.ts:

import * as React from 'react';
import * as ReactDom from 'react-dom';
import type { IPropertyPaneConfiguration } from '@microsoft/sp-property-pane';
import { PropertyPaneTextField } from '@microsoft/sp-property-pane';
import { BaseClientSideWebPart } from '@microsoft/sp-webpart-base';
import LabHelloWorld from './components/LabHelloWorld';
import type { ILabHelloWorldProps } from './components/ILabHelloWorldProps';
export interface ILabHelloWorldWebPartProps {
  description: string;
}
export default class LabHelloWorldWebPart extends BaseClientSideWebPart<ILabHelloWorldWebPartProps> {
  public render(): void {
    const element: React.ReactElement<ILabHelloWorldProps> = React.createElement(
      LabHelloWorld,
      {
        description: this.properties.description
      }
    );
    ReactDom.render(element, this.domElement);
  }
  protected onDispose(): void {
    ReactDom.unmountComponentAtNode(this.domElement);
  }
  protected getPropertyPaneConfiguration(): IPropertyPaneConfiguration {
    return {
      pages: [
        {
          header: {
            description: 'LabHelloWorld configuration'
          },
          groups: [
            {
              groupName: 'Basic settings',
              groupFields: [
                PropertyPaneTextField('description', {
                  label: 'Description'
                })
              ]
            }
          ]
        }
      ]
    };
  }
}

What this first web part teaches

This first component covers the exact basics your 2026 catch-up needs:

• SPFx project structure
• React functional component usage
• property pane binding
• local component state
• Fluent UI integration
• CSS Modules discipline

That aligns well with the earlier fundamentals block in your 100-web-part roadmap, especially the focus on HelloWorldBasic, PropsAndStateDemo, SimplePropertyPane, and BasicFluentUiForm as early lab exercises .

Why this is a better first step than starting with a business form

It is tempting to start with REST, forms, attachments, or list CRUD immediately. But for a catch-up lab, that is usually the wrong baseline. Microsoft Learn still positions SPFx as a broad extensibility framework for SharePoint, Teams, and Viva, which means your first milestone should validate the development model itself before you add SharePoint-specific complexity. (Microsoft Learn)

Once this web part works, your next sequence should be:

1. PropsAndStateDemo
2. SimplePropertyPane
3. ThemeAwareBanner
4. BasicFluentUiForm
5. SPHttpClientGetItems

That progression moves from structure to interaction, then to theming, then to UI discipline, and only then to SharePoint data access.

Practical implementation notes

Use a new dedicated solution, not your daily work solution. That separation was the right architectural decision for your study path because it avoids mixing experiments with production-like patterns and lets you version each baseline cleanly.

Keep the first solution intentionally small. One of the key recommendations from the earlier plan was not to place 100 web parts inside one giant solution, but instead to group them into smaller themed solutions. That remains the right approach for maintenance, upgrades, and comparison across patterns.

Also, do not over-customize dependencies too early. Microsoft Learn specifically recommends using the Fluent UI package version that comes with the SPFx project template, which reduces compatibility issues. (Microsoft Learn)

Limitations of this first web part

This first web part is intentionally limited. It does not yet include:

• SharePoint REST calls
• SPHttpClient usage
• theme provider integration
• async data loading
• error boundaries
• reusable service layer
• tenant packaging concerns

That is correct for baseline 1. Its job is not to be useful to the business. Its job is to prove the project skeleton.

Conclusion

Yes, we should build the web part — but we should build the right first web part.

For your SPFx catch-up in 2026, the right starting point is a small React-based baseline web part inside a new dedicated SPFx lab solution. That respects the lab structure we already defined, aligns with Microsoft’s current SPFx guidance, and gives you a safe baseline for the next 99 exercises.

Implementation Steps Table

Technical Summary Table

When to Use This Baseline Table