It’s a lot easier to learn with somebody else to help you. Trying to read a book, do that, and critique your own performance *with actionable steps for improvement *is very hard.
Also, it’s typical to foul up any reasonably complicated dish the first time. Pros will make smaller goofs than newbies, but they’ll also be aiming for a higher standard to begin with. So: Expect to need to make a new dish several times to get it going well. And plan to critique it afterwards, ideally with another eater, if not another cook. If this means you need to make marinara and meatballs 6 nights in a row to get good at it, so be it. And write down what you learn. Cookbooks are the one book I’ll take notes in; in fact I insist on taking notes in mine.
As you get better you’ll find yourself paying more attention to the gist of the recipe than the details, and doing more improv within the outline of the recipe. Which is probably just how you treat written sheet music when you sing too.
As to “season to taste”. … You know how music sounds right when the vocals and the various instrumentals are at the correct relative volumes. You can hear the drums, but they’re not drowning out the horns, strings, or singer. Cooking anything more complex than hot dogs is *exactly *like that; like running the mixing board in a sound production. Doneness, browned-ness, sauce consistency, spicing are all knobs you can twist to make the dish sing or not.
So for example: First eat some raw oregano to really taste what it tastes like all by itself. Fresh or dry doesn’t matter, just taste the type you’re going to use in the dish. Then try once to put in waay too much oregano; like 4x as much as the recipe says. Pay attention to how it now tastes mostly like Oregano!!, not like a balance of all the flavors. Next time put in no oregano and see if you can taste the “hole” where the oregano isn’t.
Now that you can recognize those two extremes you can put in the recommended amount next time then fine-tune from there until you have the amount that tastes best to you. That’s what “season to taste” means.
Yes, this all takes practice. But “practice” is really just a word that means “do something you enjoy while paying attention to the process and the results”. And since you get to eat the end product every time, practicing cooking includes its own reward.
One last point: Lots of newbies approach cooking with a rigid idea of “perfection or trash.” Nonsense. Or thinking it must taste exactly *this *way. Also nonsense. Go to any reasonable recipe website and search for, say “Chicken cacciatore” or “Irish stew”. Or even “marinade for grilled chicken”. You’ll find dozens of recipes for each dish. Each of which is different. And any one of which works fine. And each of which tastes different even if done by the very same pro.
Some have more meat; others less. Some have more spice; others less. Some include Bay leaves; others don’t. Some have lots of thick sauce; some are thinner, dryer, or both. Some include wine; others don’t.
But they’re all e.g. Chicken Cacciatore. And they all taste pretty damn good. Different from each other, but good nevertheless.