Just be aware that Imgur is blocked in the UK because they (not unreasonably) don't want to play ball with our (new, chilling) online safety regulations. I see a lot of independent static websites where none of the images load, nowadays, because the owner decided to host all their images on Imgur!
So yeah: any of the suggestions given are good, but if you use Imgur then I won't see it (unless I bother to fire up a VPN).
Me: I just drag images either to my NAS (static IP on fibre to my house, have a folder that "just works" over HTTPS) or onto my website (similar deal). Space and bandwidth are cheap so long as you're not serving multi-hundred-megabyte videos or similar!