It depends. Canning requires equipment, which can get expensive. If you're just trying to save some extra money, I would suggest drying and/or freezing things. Both can also be healthier than canning, as canning often requires relatively large amounts of salt (for vegetables) and sugar (for fruits). Fruits especially are GREAT frozen (berries are the best and easiest) and dried. You don't need a food dehrydrator, just some parchment, some lemons (for the acid) and your oven. Freezing just requires bags you can re-use.
You can also make refridgerator pickles and things of that nature.
Example: last year the grocery store I shop at had almost a hundred pounds of apples that were slightly overripe. I bought 30 pounds for $6, took them home and made applesauce. It took a few hours, but I had VATS of unsweetened homemade applesauce at the end. a quarter or it went into the fridge, the kids ate it and I used it in place of oil in baking. a quarter went into the freezer to use the next month. Half went into the crock pot with some sugar and things, and the next night I had a gallon of apple butter, which was used as ice cream topping, pancake topping (in lieu of expensive maple syrup) and toast spread for a month.
The same day, the same store also had bell pepper, normally $1 each out here, 4 for $1. I bought 40 peppers for $10 and took them home. I roasted 20 of them, sliced them, and layered them on parchment to freeze. Roasted red pepper, not soaked in oil all year long. The other 20 were halved, stacked inside of each other and frozen in gallon bags. Peppers require no prepping for freezing, don't stick together, and are almost exactly the same consistency as fresh when thawed.
Canning can be great, but can also be dangerous (green beans are easy to do wrong and get botchilism) and expensive (you must buy canning equipment).