Thanks for your reply. It definitely contains a lot of helpful information.
I indeed went through with it, and started working on it a few minutes after creating this thread. I also created a repository, and will be exploring github profusely. I’m not sure if what I’m creating already exists - I should probably check that right now.
It exists, of course sigh, haha.
While working on a new portfolio, I was having difficulties with making it responsive. So I thought: it might be cool if you can just upload your HTML/CSS somewhere, and it points out the changes you need to make for a website to be responsive, kind of like jslint. Thus, this thread.
I’m still going to attempt to create this, without even looking at the other ones.
EDIT: Should I not have created a repo yet, with just some basic HTML/CSS, or do you think I should have waited to be at least somewhat-finished?