Back to the books. Yes, I would still buy both the Lyman and Lee books. All the reloading manuals include a huge section on load data, in addition to all the reloading step by step instructions, procedures, and explanations. After reading them, if you decide to get into reloading, you will need that load data, and will refer back to the "how to" sections many times. Both books are excellent for beginners, and excellent reference material to own IMHO.
As for all the different, and sometimes opposing "advise" you will encounter on YouTube and in forums.... everyone feels their way is best. You will develop your own preferences over time. Just one example might be case cleaning. There's tons of opinions on how to do it, in what specific order, etc. The truth is, as long as the exterior of the case has no grit on it that could damage your dies, you could reload without cleaning the cases AT ALL with no ill effects.
Vettepilot