What types of images can you see on the site, not by clicking a link? I'm trying to find a new way to upload images.

What most users will do is upload the image to a hosting site like imgur, and copy the direct link to the image (starts with i.imgur) as a URL.

Right click an image (that is being stored somewhere) hit 'copy image address' and past it in a post and it will show up.

What site should I use besides imgur, google drive, or discord?

Any image hosting site should do, but I don't see why you're asking—those sites are more than up to the task.

imgur and discord cover all basis. I personally use imgur since you can actually delete posts there.

idk, might use imgur soon

@danger_ discord doesn't delete pics from my experience (then again I also use imgur). Also on discord if you post an image and delete your post, it is still stored on their servers even though you deleted it, meaning if you shared a link to it it'd still be there.