Advices for a beginner in hair care

Hello, so recently I have seen tiktoks about women growing and thickening their hair and I wanted to do the same too. The problem is that I have curly hair and that I know absolutely nothing about hair care, I only use shampoo and I have never used conditionner. On top of that I tried to search for oils to apply on my scalp but was very confused ? Some say that coconut oil is not good while others say otherwise... Could you help me please ?