How many Pokemon types are there? Strengths, weaknesses

In a Pokemon battle, types are usually the deciding facto. Here

Pokémon GO Type Chart Explained - Effectiveness And Weakness For All Types

Pokémon Go Pokemon Type Strength and Weakness Chart - GameRevolution

File:Pokemon Type Chart.svg - Wikipedia

Pokémon type chart: weaknesses, strengths, resistances

File:PokemonTypeChart.PNG - Wikipedia

Pokemon Sword & Shield - All types weaknesses and strengths

I made a simple type effectiveness chart. For each type, the types that are super effective against it are shown as small symbols above the main symbol. I find this helpful, so

Pokemon Scarlet and Violet, Types Strengths & Weaknesses Chart

Pokémon Types and Weaknesses Chart – Free Printable

Pokémon Scarlet and Violet: Every Type Strength, Weakness, and Counter

Pokemon types and weaknesses in Pokemon Go

How to Apply Weakness and Resistance in the Pokémon Card Game

Appendix:Pokémon Types, Pokémon Brick Bronze Wiki