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I’ll second @jdmore. Though, most people here are better with wild plants and the like. If you’ve made an account with iNaturialist and started uploading photos of your house plants, make sure to check the box that they’re cultivated, since they’re not wild. :)
I’ll give you a few general tidbits since you seem at your wit’s end:
Off the cuff and without a proper index to tell you taxon names, I can tell you you got several species of dracena, some golden pothos, a few others that are pretty standard houseplants. They look pretty normal from the photos. You’re going to get leaves that go brown and come off. It’s a part of having live plants. They’re imperfect, just like us. :)
The only time I’d worry is if the plant leaves are suddenly wilting/going yellow/etc all at once.