Welcome to the forum and to the game!
Build Compendium X (Forgotten Gods) under “builds for beginners” and “Resources” you can find beginner friendly guides and information.
Here is a guide about game mechanincs for beginners that I did 🤯 malawiglenn’s guide on game mechanics for beginners
And here is an introduction to Grim Dawn for PoE players Guide - How to transition from POE to GD (WIP)