Many of the bottled and jarred sauces you see in the supermarket are just versions of ones you can make easily; some are better when commercially produced. If you are talking about sauces such as Worcestershire, soy, HP, hoisin, oyster, ketchup -- flavoring sauces, then no, you don't want to make those. Trust me -- the commercial stuff is easier and usually better than any homemade version. (Homemade ketchup might be better than bought, but that's not quite what you are referring to, is it?)
However, sauces like spaghetti/tomato sauce, barbecue sauce, turkey gravy, etc. -- those are actually all easy to make, and don't really take all that much time, even if they have to cook for a long period. And the great thing about, say, spaghetti or barbecue sauce, is that you can make a big batch and then freeze it in portions, so you have it to use at a moment's notice.
Some folks may talk about the whole science of French sauce-making -- the five mother sauces, the umpteen variations -- but don't let them scare you. Many of the sauces we use for everyday cooking can be simple and even quick to make. In fact, just by making some dishes -- stews and braises, for example -- you are making sauces. And the neat thing is that if you have more sauce in the dish than you need, you can always keep it and use it on something else. How cool is that? (as RR would say

)
Let me give you an example: I'm having meatloaf tonight (to be honest, leftover meatloaf

). If I don't have any appropriate sauce in my freezer -- other than the spagetti sauce with fennel and mushrooms, because I used that last night -- I will probably just make some "beef gravy" with some fat, flour, beef stock, and flavorings. If I bought a jar of it, it would cost, what, $3? It will cost me pennies.
To finish my rambling: Start looking for recipes and try them until you find ones you like: learn to make basic barbecue and tomato sauces, and also white sauce. You can add all sorts of things to tomato sauce to vary it, and the technique for making white sauce will allow you to make many different sauces (my "beef gravy" is made exactly the same as a white sauce; just different fat and liquid).
Oh, yeah, one more thing: don't worry, it's almost impossible to get something "wrong" when you're cooking. Burning something is about the worst that can happen; everything else is just "inventing." Have fun!