Neutral Glitchless (No Aborted Genocide) is easily the best beginner category. It's 30 - 40 minutes shorter than TPE Glitchless (while having basically the same route) and lets you practice bosses & advanced strats (Kindergarten Undyne & Essay Skip Skip) with a little extra HP.

https://www.speedrun.com/undertale/full_game#Neutral_Glitchless_No_Aborted_Genocide