Hi, i want to ask how to compile linux kernel on pisi linux since i have follow a lot of tutorial on youtube and none of them are working since there will be some error such as "apt command not found", "dpkg command not found". If there a guide for me to compile the linux kernel?

You can easy build a pisi package by creating pisi build files: pspec.xml, actions.py etc. See source of official kernel package.

Before building from packages you have to install packages from system.devel:

sudo pisi it -c system.devel

Note that the pisi build files in Github are "experimental", "possibly with some bugs", "in process of heavily developement" and are not intended in production use.