Trainer experience, Pokémon GO Wiki
XP - How to Level Up Your Trainer - Pokemon GO Guide - IGN
Pokemon GO Guide - IGN
Pokemon GO Guide - IGN
Beginner's Guide - Basics and Features - Pokemon Unite Guide - IGN
Trainer level - Bulbapedia, the community-driven Pokémon encyclopedia
How to Unlock 6 Star Raids - Pokemon Scarlet and Violet Guide - IGN
Pokemon Go - IGN
Best Pokemon Go Tips - Pokemon GO Guide - IGN
Raids - Pokemon GO Guide - IGN
Player Level is King - Focus on XP Leveling : r/pokemongo