Impossible to tell from your description just what was affecting your plants. LOTS of reasons why tomatoes can develop spots and not all are fungal issues. And problems which affect tomatoes tend to be quite different from problems that affect the squash family. Without photos illustrating the problems, it's hard to make assumptions about what's going on but I'm not sure you have a lot to worry about. If you maintain a hot composting process, a great many disease issues will be eliminated. Be sure to rotate your crops for next season.

Doesn't look like disease. More like an environmental glitch.

Definitely looks like some kind of damage, but not too bad. They will probably do much better when they are planted outside. Not sure what happened to the end of the leaf in the first pic.

So I've been growing some beefsteak (I think) tomato plants indoors, mainly for fun, but I do want them to do well. They've seemed to develop some leaf curl, and those leaves have gotten kinda bumpy, like they're crinkling up almost, along with yellow-ish spots? Sorta along the veins on the leaf. The newest growth they have seems to be unaffected, but I don't know if it'll stay that way. I've tried researching what this is but nothing I've seen looks exactly like this? Not sure. If anyone could help me out that'd be very nice! - If it helps, they're under a LED growlight in a windowsill that doesn't get much direct sunlight. I just transplanted them into bigger containers (solo cups with holes in the bottom lol. Couldn't find actual pots to buy, but these are temp.) I put them in a mix of Miracle-Gro potting mix & ecoscraps natural + organic potting mix. Thier two first true leaves were getting a bit yellow before I moved them, but I chocked that up to me not being able to transplant them fast enough, I had grown them in cut up egg carton and they got much too big for it and I couldn't move them right away. They seemed to grow fine after that though, and they're still growing. Also I didn't take them out of the egg carton because they had grown into the bottom of it a bit, so I just cut off what I could without touching the roots and stuck them in there with it.