Do you want to have a GitHub user page or project page that uses your newly learned react skills but don't know how to get the reacts up on the GitHub page? If you already have the react app you are already 90% of the way there, you just need a GitHub Action to automagically build/deploy it.

TL;DR

name: Deploy React site to Pages

on:
  # Runs on pushes targeting the default branch
  push:
    branches: ["master"]

  # Allows you to run this workflow manually from the Actions tab
  workflow_dispatch:

# Sets permissions of the GITHUB_TOKEN to allow deployment to GitHub Pages
permissions:
  contents: read
  pages: write
  id-token: write

# Allow one concurrent deployment
concurrency:
  group: "pages"
  cancel-in-progress: true

jobs:
  # Build job
  build:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v3
      - name: Setup Node
        uses: actions/setup-node@v3
        with:
          node-version: "16"
          cache: "npm"
      - name: Install dependencies
        run: npm ci
      - name: Build with Next.js
        run: npm run build
      - name: Upload artifact
        uses: actions/upload-pages-artifact@v1
        with:
          path: ./dist

  # Deployment job
  deploy:
    environment:
      name: github-pages
      url: ${{ steps.deployment.outputs.page_url }}
    runs-on: ubuntu-latest
    needs: build
    steps:
      - name: Deploy to GitHub Pages
        id: deployment
        uses: actions/deploy-pages@v1

Put ^ in something like ./.github/workflows/react.yml. Then go to github.com/{{your username}}/{{your repo}}/settings/pages and set Build and deployment source to Github Actions.

If you used Create React App then the path of the build artifact would be ./build