This is a Certification tutorial comprising of 20 Courses worth 300 hours of learning by active coding offered on freecodecamp.org
Here's the course list: 1 > Learn HTML by Building a Cat Photo App# 2 > Learn Basic CSS by Building a Cafe Menu# 3 > Learn CSS Colors by Building a Set of Colored Markers# 4 > Learn HTML Forms by Building a Registration Form# 5 > Build a Survey Form Project# 6 > Learn the CSS Box Model by Building a Rothko Painting# 7 > Learn CSS Flexbox by Building a Photo Gallery# 8 > Learn Typography by Building a Nutrition Label# 9 > Learn Accessibility by Building a Quiz# 10 > Build a Tribute Page Project# 11 > Learn More About CSS Pseudo Selectors By Building A Balance Sheet# 12 > Learn Intermediate CSS by Building a Picasso Painting# 13 > Learn Responsive Web Design by Building a Piano# 14 > Build a Technical Documentation Page Project# 15 > Learn CSS Variables by Building a City Skyline# 16 > Learn CSS Grid by Building a Magazine# 17 > Build a Product Landing Page Project# 18 > Learn CSS Transforms by Building a Penguin# 19 > Learn CSS Animation by Building a Ferris Wheel# 20 > Build a Personal Portfolio Webpage Project#