Note that I'll just be putting one example for each type, so not every matchup will be listed.
Normal- Ghost is immune to Normal.
Fire- Fire/Water 4x resists it.
Water- Water/Grass 4x resists it.
Electric- Electric/Grass 4x resists it.
Grass- Grass/Steel 4x resists it.
Ice- Ice/Water 4x resists it.
Fighting- Ghost is immune to Fighting.
Poison- Poison/Ground 4x resists it.
Ground- Flying is immune to Ground.
Flying- Rock/Electric 4x resists it.
Psychic- Dark is immune to Psychic.
Bug- Ghost/Fire 4x resists it.
Rock- Steel/Fighting 4x resists it.
Ghost- Normal is immune to Ghost.
Dragon- Fairy is immune to Dragon.
Dark- Dark/Fighting 4x resists it.
Steel- Steel/Water 4x resists it.
Fairy- Fire/Poison 4x resists it.
Source
Hope this helps! :)
So, every type is 4x resisted or a type has an immunity to it.