Hey guys, if i wanted to create a website which allows users post images or comments how will i go about it?

Question

Html css?

Answer 1

Here you write about comments, users, etc. It's a server side of web page. If you want to use JavaScript as server side you should to learn Node.js. Besides that you can use PHP, MySql etc . . .
here example:

https://www.sololearn.com/Discuss/581601/?ref=app
hope i understood you . . .

Answer 2

I'm sorry, but you are not going to make a website which allows users post images or comments with html or css