How to use Python to create a forum website?

I'd like to build a website using Python. I have a lot of free time and I figured that I'd like to make a website which reviews pretty much anything.

I have looked at website builders etc. but I feel like I'll gain more from the experience if I code it myself.

I know python to a decent level but I have never touched html, I know that I can use flask (though I'd have to learn it) to build websites using python.

Are there any other resources that you'd recommend? Should I try to actually code it or just find a website builder? Any help is much appreciated :)