It's always hard to start Learning new Things if you don't have any proper guideline and also take lots of time to find an exact resource to start with, Even someone give up following the wrong path.
In this post, I will try to Point out some Awesome Free Resources That Help Beginner Developer To Learn HTML&CSS In Right Way.
01.Youtube Videos
Brad Traversy is one of the Great Teacher who teaches millions of developer. If you want to Boost confidence in HTML&CSS Then follow his videos and complete the practice project.
Brad Traversy's HTML&CSS Tutorial Series
The Net Ninja(Shaun Pelling) will take you from the full beginner to build great-looking HTML & CSS pages in this crash course series.
HTML & CSS Crash Course Tutorial From The Net Ninja
If you want to Learn More then follow these Videos
CSS Tutorial - Zero to Hero (Complete Course) From freeCodeCamp.org youtube Channel
Learn HTML5 and CSS3 From Scratch - Full Course From freeCodeCamp.org youtube Channel
Complete CSS Course For Beginners to Advanced in Hindi from Tech Gun Youtube Channel
If you Want to Learn more in depth HTML & CSS Then Follow These Sites
01.developer.mozilla
02. w3Schools
03. freeCodeCamp
Thanks for reading and if you think something missing then doesn't forget to mention it via comment or reach me on Twitter
Happy Learning :)