I checked around a bit more and in Random Images we use the 500 x 500 px rule. This would apply just about anywhere else I believe, but nobody's going to be measuring your posts to the pixel and most likely if you do post something too large a mod will just edit your post to add a spoiler tag and possibly message you about it.
I don't believe we have a hard and fast rule, but in general I think a good guideline is around 500x500 pixels max. Definitely spoiler it if it stretches the page or can't fit on a screen at 100%, and probably a bit smaller than that. The spoiler threshold for gifs tends to be a bit smaller since they are bigger files.
Hmm... that's really interesting! I don't know much about fencing tbh. You played three periods though... that must've been nerve-wracking to say the least. Still an accomplishment! ... Did you really mean the grandma part? That lady must've been amazingly fit for her age.. LOL. XD
Well you have to be able to present company information in different ways (i.e. for investors vs for managers) and prepare reports about how healthy the business is and give managers advice, so a lot of it is analytical stuff you have to do. There are lots of estimates involved. XD
Oh, that's nice! I actually wanted to do that. I'm in my third year of accounting, but I want to switch to programming or graphic design... but it's kinda too late to do that now. *sniff* And yeah... kinda not realistic to bank your whole future on sports. If only. XD