Most store-bought jam is made with more sugar than fruits. You like it sweet? Add more sugar. You like it tart? Add more lemon. You like it chunky? Don't puree your fruits. Have your jam the way you like it.
Jams are great on toast! But you can use it in more ways than that. You can mix it with yogurt, stuff donuts, make cocktails, glaze meat, the possibilities are endless!