You are doing well to have gotten this far. You don’t HAVE to learn anything, and be as ignorant as most people are out there. Prior to lithium batteries the ignorance about NiCad and NiMh was, and IS, just as lacking.
It can be complex, but some basics can take you a long way. Then you can continue from there should you decide to.
BatteryUniversity is encyclopedic, but pretty well organized and you can read about particular topics as you need them. I used it a LOT to start. They lack particulars, but that’s what BLF is about.
Personally I think the core of this is not the light, the ‘end product’, but the battery, the driving force. Strongly suggest you start with that. The danger is in the batteries, less than the light. You don’t have to know ‘everything’. Some fundamentals are critical for safety, and function.
Lithium Ion Battery Safety 101…… Lithium-ion battery safety 101
Unless you decide this is ‘too much’ and go dead simple with safety proven lights with USB charges, then consider a good charger too. That is a subject all to itself, but there are outstanding reviews here, best on the web.