It is rightly said examples are better than Thousand Words. Examples make your task easier.
For HTML : To Define content of web pages. ( It can be any web page).
For CSS : To Work for Layout of Web Pages.
Program : To work for behavior of web pages.
Apart from many Desktop programs also use this Language. Popular database also use this programming language for their functionality.
Many questions are available online. Once you complete some concepts. Try to test your knowledge. Know your strengths. Pay special attention to important topics.
- Look for Content settings.
- Click on that.
- You will see Allowed Recommended option.