In no particular order:
Go to the local Lowes/home depot and get a couple of their basic carpentry books hNdyman books.
Subscribe to a couple of basic woodworking/carpentry magazines
Pick a specific project, lets say build a basic coffee table, search the Internet about it, pick one, buy the basic tools to do it and then actually do it.
Pick your next project, lets say upgrade the door hardware in your own house, research it, buy tools, do it.
you really won't learn until you apply the theory you are reading about.
Ask questions when you are unsure how to proceed or get yourself stuck in a corner doing something.
etc
etc
Buy more comprehensive books. Modern Woodworking and Modern Carpentry come to mind
Find a mentor, preferably someone retired, take him to lunch once a month, pick his brain on your current/next project.
Believe in yourself.
I've even said I'm too dumb to know when not to tackle something. My biggest project to date was building a 1000 sq ft addition on to my last house. Everything except the masonry work.
Dont be afraid to make mistakes. 99.9% of them you can recover from or hide them so only you know you screwed up.
When I was first married I remodeled my own kitchen and built my own cabinets. That was before the Internet. Bought a decent table saw, router, sander or two, vice, and a drill press. First thing I made was a very basic workbench out of 2x4, 2x10 and a few 1x8 boards. All nailed together. Still have it as my main workbench 50 years later. Made a couple of wooden saw horses too. That will get you figuring out angles. Just threw mine away a few years ago.
Bottom line is pick a project, simple at first, research it, buy the tools to make it and then go do it.
Rinse, and repeat.
As my 33 year old son is finding out, theory is great, dad makes it look so simple, yet applying theory and what I saw dad do is something else. He does all his own maintenance. Even the crap ones. Sometimes they teach you more than the 'fun' projects. He lives 350 miles away so I give lots of remote advice to him.
My experience says you probably don't save much money doing it yourself until you have accumulated enough tools over a few years, but you get better quality of product/work and have the tools. Besides you learned something. Even if it was how NOT to so something.
Lastly, don't buy crap tools. Buy good quality and have them for a lifetime. Buy them from Harbor Freight, when they break or frustrate you, buy them from Harbor Freight again, third time around, buy good name brand tools like Bosch, Milwaukee, Dewalt, etc like you should have done the first time. You will also find you never have all of the tools you need. Eventually you start buying tools that aren't mandatory but make the job go faster/easier with less frustration.
Its all a ongoing learning process some of which includes periodic enrollment in 'the school of hard knocks'.
Oh yeah, forget 99.9% of what you see on those crap home remodelling, do it yourself reality programs. Now you can learn from a few programs like This Old House or the woodworking ones that were on PBS by Norm Abrams.