So i have a channel and hopefully it will be monetized soon . So i was thinking is it possible to make tutorials using houdini apprentice ?? or this considered illegal and i can't use it !!??

Hi,
While you can make tutorials using Houdini Apprentice - because of it's non-commercial license you are not allowed to gain any income, of any kind. So in your case, a monetized YouTube channel would be a violation of that non-commercial license.

My advice would be to keep practicing with the Apprentice version, and build a strong brand, while saving up for the Indie License before trying to monetize your work with Houdini.