Most electronic music has transition effects such as impacts or sweeps.

Browsing sample packs can be a long process; sometimes it’s quicker to just make your own. Doing so will also help give you develop more of a signature sound too. 

I like to use percussive elements or synth patches with a big wash of reverb, export to audio and then process it with further effects, reverse it and/or splice up for gated effects for example.

Sometimes simple works best too for example taking the snare from your groove and exporting it with reverb can make a great impact which sits really well with your groove.