Welcome, @InfinityMadison. I just wanted to add that the readings here are not necessarily exhaustive either (e.g. 生), but as @Joeni mentioned are chosen to support the vocabulary you’ll also be learning as you go. So, while having a bunch of readings attached to each kanji can feel quite overwhelming at first, there is a reason to do it this way. But try to stay loose, as you may learn other readings out in the wild in the future.
One more thing - the example you’ve given, 人, is particularly auspicious because a lot of people, including me, often forget which reading it takes when using it in different words. Start focusing on that difference between “nintendo” and “jeans” in your mind now, and add it into the stories and mnemonics you learn or create for individual words. Good luck on your journey.