In this Unreal Engine 5.3 Niagara tutorial, we dive into the Initialize Particle module and break down how Position Modes work! Learn the exact differences between Simulation Position, Unset, and Direct Position, plus how to use offsets to position your particle effects precisely. 
https://dev.epicgames.com/community/learning/tutorials/JdlzJ/unreal-engine-ue5-3-niagara-basic-initial-position-17