My favorites are:
1.
Pewdiepie - He's always been on fire and I love the types of videos he makes right now.
2.
LinusTechTips - Talking about modern technology and doing crazy, stupid stuff in a fun way!
3.
Fedmyster - A funny IRL twitch streamer that makes entertaining youtube videos.
I also like kurzgesagt, Danny Duncan, Ryan Higa, videogamedunkey, jacksfilms, scishows, yestheory and many more!!
Just gonna shamelessly plug my own YouTube channel at the same time -
Nikoksen. I mostly make osu! videos and other random stuff while trying to improve the quality of my videos. Check it out if you have some spare time! Thanks <3