A strengths and weaknesses chart I made because I was having

Pokémon Go Type Effectiveness and Weakness Chart

Type Match-Ups, P-Empyrean Wiki

Pokemon Type Chart by DigiArtopia

Pokemon Type Battle calculator by Shiningstarofwinter on DeviantArt

Pokemon Games :: Types Explanation

Pokemon Type Calculator - Pokemon Type Chart

Pokemon GO Evolution/CP Calculator

Spreadsheet with the entire dual-type chart + type coverage

Pokemon Scarlet & Violet Type Chart: every type strength, weakness

Easy to read Type Effectiveness chart for newer players. Easy to read and understand (courtesy of GoHub) : r/TheSilphRoad