Talk:Damage 2.0/@comment-174.109.112.185-20160728052518/@comment-27279105-20160802131718

you don't have to remember everything, just the best elements against the strongest enemies:

[Enemy - Best Physical Type/Best Elemental Type]

Bombards/Lancers - Puncture/Radiation

Heavy Gunners - Puncture/Corrosive

Grineer without armor (for example by using Corrosive Projection)/Flesh in general - Slash/Viral

Ancients/Boilers - Slash/Corrosive

Corpus Tech/shields in general - Impact/Magnetic

For bosses just look on their wiki or codex page, what health/armor/shield types they have and what they are mostly weak against.