>>24457705Even this video misses a bunch of stuff, like a lot, and I think it gets some things wrong, but it's been awhile since I read the books so take that last part with a grain of salt. The main thing that's missing from the games that was in the books is just how much of the story follows Ciri, and Geralt's hanza (party), the group that helps him find Ciri.
>>24457502 (OP)>Should I read the books so I can better understand the games?No playing the games is all you need to understand the games. Reading the books help with background information, some world building, and being able to flex canonical knowledge from the books that's not included in the games.
>Do the games change the narrative described in the books too much?Not enough that it matters. Some characters become more prominent and some more minor but generally the changes made in the game neither harm nor improve the story. They work for the games and don't really compete for space or affection in your head if you experience both books and games.
Read the books because they are good all on their own.
Play the games because they're fun games.
Together they make one of the better examples, possibly the best example, of how to do a good adaptation. Quite literally the only other work that's as good of an adaptation is No Country for Old Men. The movie is as good as the book, with very, very, small changes and the changes that are made improved the story for the screen.