https://www.mangago.me/read-manga/gekkan_shoujo_nozaki_kun/
https://www.mangago.me/read-manga/oresama_teacher/ - teacher x student friendship. I swear there really isn't any romance to this. I enjoyed it for the laughs tho. Same author as above
19 days
Nan Hao & Shang Feng
Cool Doji Danshi
Boys dormitory 303 (this is a BL)
Nichijou
Heaven's Design Team (haven't read, but the anime was pretty funny + unique concept)
Lookism (a bit more serious, but has some pretty funny moments)
Kamonohashi Ron no Kindan Suiri
Mashle: Magic and Muscles
Binan Koukou Chikyuu Seifukubu Love! (haven't read, but the anime was hilarious)
Danshi Koukousei No Nichijou
Any manga which is funny asf with a close friend group?