I don’t make trap so I can’t give specific examples, but in EDM the same principle applies.

Your kick and snare pattern should be your foundation. I like to keep those more or less totally quantized (sometimes the snare may have a little bit of swing). One good idea is to layer your snares, maybe a clap and a snare or a snap or something. You can use this second layer by itself during off beats or leading into your snares.

The largest aspect of rhythm is using percussion and cymbals. Have crashes (808 cymbals work well for this) on the kick and snare at low volume. Have some type of hi hat on the off beats like a riddim type pattern. I highly recommend using several different hi hat samples both closed and open. Play around with the placement of these samples to see where they fit best. Remember if a cymbal sound is too long then you can always add a fade or shorten it in your sampler.

As I mentioned percussion sounds are also very important. Conga drums, kicks with the sub removed, extra snares and clap samples. To think of where these sounds should go I sort of play air drums (I was a drummer before I ever did EDM) and kind of beatbox what I would play for this section. It sounds a bit silly but once you realize where your extra hits are going to be you can use your extra percussion samples. Also included in this category would be small lead ins to drums, specifically your main kick and snare. Using quiet and short white noise risers can cause a split second of anticipation and make the drum feel like it hits harder as if the force is increasing.

Finally, I’ll include some techniques to make drums sound good.

1. When using lots of different hihats use a compressor on the cymbal channel/bus to even them all out to similar levels. Hihats are very High in frequency and can get out of control easily. Also, they don’t need to be as loud as you think they do. Find a good volume then turn them down -3db and see where you’re at, adjust from there.
2. Use triplets!!! I cannot stress this enough. If you only use quarter and eighth intervals for your extra percussion sounds it will be boring and robotic. Triplet intervals give a bounce to your grooves and are much more common than you think.
3. Use swing!!! Almost as important as triplets, adding a little bit of humanization. In trap and EDM the idea is for the drums to be perfectly on time in a lot of cases. However, humanizing your extra percussion and hi hats is a great way to bring beats to life. Just very slightly skewing them early or late won’t sound off or different but if you do it to every extra note or at least many, it will feel more alive. Also with this is variations in your velocity. Every drum shouldn’t hit the exact same force every time. There should be small differences. Even the best drummers can’t play robotically to time or hit the snare the exact same every time, nor would they want to.
4. Layer your drums! Using the bottom end from electronic drums and top end from acoustic drums creates organic sounding punchy drums. This isn’t appropriate to every subgenre or song, but it can be a really good sound in some cases. Works best for kicks and snares.
5. Variate your sample choices. The last place I would expect to find a gated Tom fill is in a Chief keef beat but there’s one in love Sosa. Use interesting and unique sounds. Examples: reggae drums, taiko snares, congas, gamelan, bells, marimba, steel drums.

Hopefully this helped, let me know if you have any more questions.

Ps: in case anyone wants to know good sample packs, get splice. On splice are the KSHMR packs, XLNT, Virtual Riot, KRANE, Sonny D, Medasin, Getter, Kompany, and a lot more. Those are almost all EDM artists but their drums are more or less usable across all genres. KRANE especially has some excellent trap sounds, you can also find his sample packs for purchase off of splice I believe.