heya there so im new to speedrunning so maybe i just dont understand the rules but can i use the in-game timer at the end to count my score? thanks

Hollow Knight runs use an autosplitter with Livesplit. It takes out all of the loading time between rooms and puts people with different computers on an equal playing field. To my knowledge the mods won't accept the in game timer and will just time the length of the video if you're not using livesplit, which will be much slower. Here's a guide on how to get it set up: https://www.speedrun.com/hollowknight/guide/cg9vl

Also there is a speedrunning community in the Hollow Knight discord: https://discord.com/invite/hollowknight