Judge: as the others have said you can't have too many books. Are you also loading BP, that will require more and for that some of the cartridge specific books like those from Croft Barker are excellent. I personally like hard copies I can directly compare back and forth, "split-screen" does not do it for me. Don't throw away old books when new ones come out, often they omit data from the previous issues

You might also investigate reloading courses both online and in person. Here in Germany you require an "explosives license" (Sprengstoff Urlaubnis) to buy gunpowder, to get the license requires taking a in-person course and passing the State test. If you want to use BP you must also take a combined course (muzzle loader/Nitro). They do not teach reloading BP cartridge and tell people reloading duplex is against the law although no one can show me the law....
Local contacts are a great resource, ask at your suppliers if they can give you contacts for you local area. Ask around at your hunting/shooting club(s). Having someone close who an help you resolve mechanical issues with your equip can be of immeasurable value. First time you get a case stuck in a die can be damn frustrating and a local contact will probably have what you need to quickly resolve the issue and get you back going. I have a new reloader here in the neighboring village that purchased and equipment set composed of mixed manufacture stuff to include Hornady dies for 7x57. His father had a bunch of old RWS brass so he thought he would start off with those. First case in the sizing die and everything came to a halt. He called so I went over to have a look. The case was stuck in the die with the rim ripped off. I removed the sleeve from the top of the die that held the decapping rod then I put two dies lock rings on the body and tightened them against each other. I then put the die and what was left on the case head in a vise, clamping the case head onl and was able to turn the die freeing the case from the die but the decapping rod was still stick in side. Looking at the other cases in his reloading block I noticed they were all old Berdan primed cases. I cut the head off of the case with a hack saw hoping we could salvage the rod and sizer button but no luck. Long story but he went back to the shop and got a new set of RCBS dies a few days later. Unlike RCBS, the decapping rod in Hornady dies he had was only held by friction. I know they told him about Berdan and Boxer during the course but he probably forgot in the excitement of getting going.

Only 3 languages?  Most college educated Germans I know speak at least German and English.  Most are also conversant in at least one other language.  30 years ago it was mostly French, now Polish, Czech, and Russian are common 3rd languages.  Every Swiss engineer I’ve ever worked with spoke German, French, and English more fluently than I speak English.

Funny joke…
Someone who speaks three languages is trilingual 
Someone who speaks two languages is bilingual 
Someone who speaks one language is American

I speak English
Ich spreche Deutsch
Я говорю по-русски
我说一点中文
Listed in order from most to least fluency    I’m fairly fluent in German, but basically an illiterate idiot in Chinese.

Uncle Sam taught me to speak German and Russian during the Cold War.  Good times.  I can still carry on a conversation in most subjects in a German, but my Russian is a bit rusty from lack of practice. I could get dropped off in Russia and survive, but I’d have a rough time for a few months.  I’ve picked up a fair amount of Chinese from working a lot in China.  I can’t read much, and can write nothing past my Chinese name.  However, I can do most daily tasks in Chinese like order food, ask for directions, and make pretty girls laugh.  That last item is worth the effort.

German Gymnasium students, the German version of high school, not a place to work out, are required to learn German, English, and a foreign language.  Since Gymnasium is the university track in the German school systems, most college grads speak 3 languages.  Some better than others.