@Auntiejessi3, tomatoes are a lot of people's "gateway" canning experience. You don't need a pressure canner, so the up front expense isn't too bad. Corn and beans MUST be pressure canned. A pressure canner can be pretty pricey.
NOTE: a pressure canner and a pressure cooker are not necessarily the same thing. Instant Pots, for example, are pressure cookers, but not safe for pressure canning. Unless they've made a newer model that is; I don't know.
Get a copy of the Ball Book of Canning. It will tell you the nitty gritty of how to do this. Depending on the edition, it'll have lots of recipes for salsa, sauces, jams, etc.
Check out estate/yard sales to see if anyone is selling a canner, pressure canner, jars, and lids. I've never seen canning equipment at my local Goodwill store. I bet that stuff goes fast.
If you're thinking you want to can a lot of stuff, be on the lookout for boxes of canning lids, too. In 2020, they were very hard to find, and got pricey. There were lots of complaints from people not finding lids, and the lids they did find were failing, ie, not sealing.
I got these online:
https://www.fillmorecontainer.com/70mm-generic-lids-silver-bulk.html
I didn't have any problem with them sealing.
Ask any questions you want to! We all had to learn somehow.
Excellent information ^^^.
Canning tomato based items requires a certain level of acidity. Even with "high acid" tomatoes I still add the lemon juice or citric acid per the ball canning directions. It's there to prevent botulism.
Strawberry jam is a very easy and fun jam to make. Some require pectin to be added but some fruits like plums have enough pectin in the fruit already.
When canning it's good to keep in mind how you will use the items so you use the best sized jar for how you want to use it.
Most importantly.... Have fun.