Introduction GitHub Actions is one of the most popular CI/CD tools today. This guide covers everything from basics to advanced techniques. Basic Workflow Structure name : CI/CD Pipeline on : push : branches : [ main , develop ] pull_request : branches : [ main ] jobs : test : runs-on : ubuntu-latest steps : - uses : actions/checkout@v4 - uses : actions/setup-node@v4 with : node-version : ' 18' - run : npm ci - run : npm test Enter fullscreen mode Exit fullscreen mode Matrix Builds Test across multiple environments: strategy : matrix : node-version : [ 16 , 18 , 20 ] os : [ ubuntu-latest , windows-latest ] Enter fullscreen mode Exit fullscreen mode Caching Speed up builds with caching: - uses : actions/setup-node@v4 with : node-version : ' 18' cache : ' npm' - uses : actions/cache@v3 with : path : ~/.cache/pip key : ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }} Enter fullscreen mode Exit fullscreen mode Reusable Workflows Create reusable workflow: # .github/workflows/reusable-test.yml on :…