As a > level 20 player, if I was to start the game again this is how I'd play it. (Useful for people looking to catch up or make a second account).
When should I power up a Pokémon in Pokémon GO? - Quora
First Pokémon GO Player Hits Level 50 With A Boost From A Bug Fix
How I climbed to top 2k with the (Go)Goat Pokémon : r/VGC
Released] Pokemon Pathways (11/2/23: Alpha 8.1) - The PokéCommunity Forums
THE WORLD'S FIRST LEVEL 50 + FIRST TIME EVER CATCHING THIS! (Pokémon GO)
LEVEL 50* REVEALED! COMPLETE TASKS, REQUIREMENTS & STRATEGIES - LEVEL 49 & 50!
Emerald hack: Pokémon Modern Emerald (Complete, 1.5 Released! Following Pokémon, Modern Battle Frontier, and more!) - The PokéCommunity Forums
What are the different types of items available in Pokemon GO, and how do they enhance gameplay? - Quora
Pokémon GO: What's a 'good' amount of CP for a newly caught Basic Pokémon? - Quora