I'm gonna go out on a limb here, and suggest - urge - the purchase of one, or better, two, actual published manuals. All data sources have error. Cross-checking helps make sure you aren't using someone's typo!
And, if you have two manuals, you can compare one to the other, and compare any digital data you get to both. Then, you can keep a manual on your bench, open to the page for the cartridge, powder/bullet weight you are using, just so you can make sure you have it right.
I've seen a few boo-boo's in my years of shooting, and all arose from wrong data, wrong charge, wrong powder. I find it hard to cross check, and go back and re-affirm data fround on-line. I mean, if you print it all out, you can, but then you have a self-published manual!
The cost of a manual, up-dated every few years, is peanuts. One cracked frame, blown cylinder, ruined bolt face far exceeds all the mauals I have bought over fifty years.
Plus, the instructions and discussion by folks like Hornady and Sierra are fact based. not like what you may encounter from on-line sources writting under a forum tag line.
Why so many printed manuals that end up going out of date???
There are many online, free areas with load data to do your cross reference checks with, if you are that worried about errors. Hodgdon site, for one, is a great resource.
If you can hook up with someone local to help show you the ropes, that is one of the greatest resources out there, just remember, everyone has their own little spin on how things should be done, and they aren't always the best or most productive ways.
My dad for instance was always by the book and didn't venture. So when they published a load that was the best combo, that they tested and found, he tried to copy it to a tee. Not even veering off on overall length, even though he never ever used a comparator kit. What I'm saying is he could have set the OAL to his chamber, and it might have shot better than the book suggested lengths.
And I'm going to say this here as well, but I understand that for newbs it might not be the best. Go slow and learn, cross reference everything. I recently started with a 450 bushmaster, and it is in a falling block ruger #1, so it can and will take more pressure than a standard bolt action, or AR type platform most loading manuals list data for. I am exceeding all max load data on the manuals I have read, but still watching for the signs of overpressure, so still cautiously proceeding. No flattened primers, no built up ridges around the firing pin on primers. I have seen pressure spikes on my other rifles, so I am more confident in proceeding with things like this, and still going slow. In fact the bullet tip I'm using in it is for the muzzle loaders, so no printed data on it, but I can cross reference to similar data, and go slowly forward. I'm now in year 3 reloading, and still lots to learn, but not afraid to step out of the norm, cautiously.
So take the books as guides, not the "bible", but as always proceed slowly, with GREAT CAUTION, and learn on the way.
Get a binder, or folder going when you start, and take lots of notes, and jot lots of data that you use along the way. Creates a great reference for your self and your rifles along the way, with different components.