<iframe width="560" height="315" src="https://www.youtube.com/embed/NtrAx-rVgco" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
This is an atypical post for me, but I'm going to plug a youtuber named Joseph Anderson who has put a TON of work into his most recent project, a complete breakdown of the Witcher series. He has played Witcher 1, 2, and 3, plus the spin off games, and has read all of the books. As someone who has enjoyed his analysis for a long time, he's been working on his Witcher videos for literal years. For people who enjoy his work, they've become legendary as he's been very open about how much work he has put into this series.
He just released his first video on the Witcher 1, which clocks in at 4 hours long. I've watched through it in 30 minute segments and think it's a great watch. If you like the Witcher, but haven't played anything but Witcher 3, I think you'll enjoy this as it basically tells the story of the first game.
Tl;dr: There's a good breakdown of the Witcher video games and books that's going to be longer than the Lord of the Rings Trilogy, and its going to be put on Youtube for free. I'm spreading it because the man deserves some clicks.