Welcome oskarcaz, good for you getting into EDM.
To start off, most EDM genres are differentiated by Beats Per Minute, BPM.
Here's a little guide, although it isn't the end-all be-all guide, it's a good place to start.
100 BPM - Glitch Hop, Mid-Tempo Dubstep
110 BPM - Moombahton
128 BPM - Electro House
140 BPM - Dubstep
175 BPM - Drum & Bass (Half-Time DnB or Drumstep is at 87ish)
These are just rough tempo estimates, everything isn't exactly like that. I didn't include Trance or House either, I don't listen to them.
Now, to only give you a BPM guide wouldn't be very helpful. So I'll give some small descriptions on each genre.
Glitch Hop is usually pretty dark stuff, but it doesn't have to be. It has hip-hop roots I believe, it's a solid genre. Mid-tempo dubstep is very similar.
Examples: The Glitch Mob, Cryptex, Opiuo, KOAN Sound, Pretty Lights, Culprate, ill. Gates
Electro House is basically dirty house music, it's more intense and more fun in my opinion. It's very popular in clubs etc, Moombahton is basically a slowed down version, it's very bouncy and energetic.
Examples: Zedd, Porter Robinson, Feed Me, The M Machine, Knife Party, Dillon Francis (Moombahton)
Dubstep has just started to gain a ton of popularity. It's been around for a little over 10 years and was originally influenced by Dub and Garage music. Now it ranges from minimal deep stuff to insane electro influenced music (some people call it Brostep). In between is chillstep, and there's also the really heavy stuff as well. I apologize for saying stuff so much.
Examples (Deeper): Truth, Reso, Biome, Skream, Distance
Examples (brosteppy): Skrillex, Kill The Noise, Datsik, Flux Pavilion
Examples (chillstep + in between): Gemini, Nero, Chasing Shadows, Emalkay, Numbernin6
Examples (heavy/filthy): Trolley Snatcha, Funtcase, Torqux, Tim Ismag
Last but definitely not least is DnB. DnB and dubstep are my two favorite genres, dubstep takes a lot of influence from DnB. The genre is fast paced, complex, and amazing. It spans from liquid smooth (Liquid) to dark and erratic (neurofunk). There is also some in between, as well as half time DnB (drumstep).
Examples: Camo & Krooked, Chase & Status, Shockone, Dirtyphonics, High Maintenance
Examples (Liquid): Netsky, Logistics, Rollz, Hybrid Minds, High Contrast, SPY, Brookes Brothers
Examples (neurofunk): Noisia, Spor, Xilent, Evol Intent
Examples (drumstep): Terravita, Tantrum Desire, Figure
That's just a little intro to the EDM I listen to, hope it helps, sorry for it being disorganized as trying to do this on my phone.