Elementalist Build

I have been leveling a which to become an elementalist with a specialty in Lightning damage. This is the first time I have really played the game this far, but it seems that all of Rare+ mobs I fight are resistant to all elemental damage. I am only in act 3, but am concerned that the build may not be a good idea if I can barely do damage to in endgame content.

I had a problem killing a metamorph boss yesterday which has lead me to these concerns.

Mobs will often have resistance, either baseline or from map mods / metamorph mods, you have ways to counter them by using various sources of resistance penetration, like conductivity curse, lightning penetration support and many more.

Good usage of elemental equilibrium node can also lower the resistances of the mobs, but you have to use another spell of different elemental type to do it.

If you're really new I'd suggest find a good build guide and follow it, you will learn a lot about how to build a well rounded character.

Enki's arc witch is a beginner friendly build, you can check it here: https://www.pathofexile.com/forum/view-thread/1147951