Brother i am so jealous of you that you get to watch this masterpiece for the very first time
My only advice:
1. Stay away from any and all online discussions, memes, reels, videos etc. Don't Google anything.. This is an anime filled with twists and was the most popular anime when it was airing. So the internet is full of spoilers.
2. The very final season was split into part 1 and 2 (and then a movie to finish it off). The part 2 opening music has a very very very big spoiler FOR THAT SEASON. Yes they spoiled one of the biggest things in the fcking opening song. Try your best to avoid the song when you watch those episodes if you reach that far.