Having resumed reloading a couple years back after decades long break, had to learn process again. Had general concepts down, but general concepts are not same as specifics and you need latter to do a good job of loading. Have concluded it is not hard to do, but neither is brain surgery if you know how.
Have refreshed stash of reloading manuals, now up to about 4.....plus numerous other sources of reloading data. Then there is the Internet. Forums and videos. A lot of online information to sift thru. Some of it is even true. Beyond that, there are numerous ways to do the same job. Like trimming cases, weighing powders, setting up dies, etc. No consensus on any of that.
But as to the manuals, all have the general stuff you need to know, but there is a lot of variation on the how to's, conflicts and some fall flat on specifics. Like what? Like load development methods.....not generally, but specifically. Mostly because there is no generally accepted method of doing it. Lot of voodoo out there. But read them all and you eventually get to a consensus on most things. Then all that goes out the window when you actually try to load something for yourself. Whole new set of questions, whole new set of solutions.
But yet another reason for multiple manuals is there is so much variation in load data. Some of it so far off the mark you can only conclude it was never tested. No clue where they got such numbers. Like what? Like loads that call for so much powder it overflows the neck of the cartridge 2 grains before you get there. So I now search for at least 3 different independent load data sources trying to seek consensus.
Then comes the payoff. You fire the ammo you built yourself and the holes start touching. No better feedback than that.