Never canned anything before, but am intrigued by you photo, how long does this stuff last before it first doesn't taste fresh or good and second isn't safe to eat?
It depends on what it is, but most stuff is good for 1-2 years.
We are still eating some 2015 salsas and jams. Typically though we try to keep stuff under 18 months.
It doesn't usually go "bad" after that point,but stuff like salsa gets more mushy, or flavours may decline.
Our highest volume use (and so what we make most of) is tomato salsas, pepper jelly, and pickled veggies. Most of it is from our vegetable garden.
The jams we mostly give as gifts.
Some of it is just finding uses for the surplus we often have. My wife has made zucchini salsa and zucchini relish because we have so much (I have about 15 zucchini sitting on the kitchen counter right now waiting to be used).
Interestingly, I don't really like any of the pickled stuff like the cauliflower, cabbage, pickles, and beets, but I enjoy making them. My wife, kids, and other extended family love all that stuff though.