Wow, thanks for all the tips guys! I just read trough them, and I will watch the two videos afterwards. My hands don't get oily or sweaty at all, so that's a good thing right? And I thought it wouldn't be a good idea to faro them, especially beacuse there not totally broken in yet, and because I'm not very good at it. Basically riffling, dribbling and fanning are the only things I've done that might harm the cards in a way, dribbling probably being the most harming from what I heard from you guys.
I actually showed some magic tricks on a sort of family reunion, which was really cool. The idea was that I would show some tricks to a family member that liked magic when I showed him around two months ago. Then I still was terrible at card handling, DL's and stuff. Also, the cards just didn't really work and he kept heckling and stuff, telling me how I did it etc. Well, not really to annoy me, but because he was just really curious, so I can't blame him. Anyways, I showed him a few tricks, but then other people started watching too. After 45 minutes of showing some tricks, they were pretty impressed and trying to figure it out. I also showed two card monte, the one where you let them hold on to the cards (I think aces are most used cards for the trick). That one was really awesome too, the person I did the trick on squeezed so hard on the cards, so he thought I couldn't change them. But then they were talking about a pretty famous Dutch mentalist (I'm from the Netherlands), that he did this kinda stuff too. And they started joking about how I might be able to read minds too, because that mentalist did mind reading tricks too. The good thing was that I didn't force a card yet, so I was like: 'No sorry, I can't read minds. Or, I could try.' So I forced a card and let him show it to everyone. I obviously already knew what the card was, so I was thinking of a cool way to tell him what the card was. He asked me if other people could see it, and I said: 'Yes, show everyone the six of diamonds'. That was definitely the best moment of the whole night, everybody was amazed. The only bad thing was that after I showed three card monte to a few kids, they wanted to inspect the cards, but they kinda bend them doing it. But after they sat in the box for the night they're almost good again.
Just realized that the whole story doesn't have to do anything with the subject of handling cards, but it's a waste to delete it now :3 Anyways, thanks again for the tips and sorry for the long story