"Electronic music" is a very vague term, so it's hard to tackle the question. Even "ambient" is an incredibly nebulous, open-ended descriptor, considering it's existed as a "style" since at least the 70's… But that is one clue I can offer you: Check out anything labeled "ambient".
As someone who is also pretty clueless about the majority of "electronic music", and someone who can't differentiate between the majority of micro-genres and self-indulgent, post-internet pop-up/flavor-of-the-month electronic music fads (all the millennial Macbook electronica I hear these days just sounds like poor imitations of old Richard D. James/Boards of Canada stuff to my ears), I can't hold a conversation about much of this stuff, but experience has shown me that, for all of its variation, "ambient" music generally lends itself to relaxation, meditation and/or introspection (as opposed to rump-shaking). I'm not saying that all ambient music is "light" or "relaxing". It can be made to sound very sad/moody, or even malevolent, but at its most basic, it's (generally electronic) music that provides atmosphere and allows your mind drift. I tend to like music that seems to have some emotional depth. Stuff that evokes bittersweet nostalgia and a sense of dreamy surrealism in equal measure. The way I interpret it, what I enjoy best is not "light/happy", per se, but it's good "lie in bed in the dark and stare at the ceiling and wonder where it all went wrong" music, I think, and that's basically how I "relax".
Technically a DnB track, but it has a very trippy, icy, nocturnal vibe that I find very reminiscent of being under the influence of certain synthetic dissociative substances. Might be good for relaxation: https://www.youtube.com/watch?v=KjrjbDOI5pI
A couple of other artists (also not "ambient" in the strictest sense of labeling) that immediately come to mind for me are Hex (this one) and Mono Junk:
https://www.youtube.com/watch?v=aQGBQ2BMQ28
Youtube Video
If you're open to Hip-Hop (which is something I know even less about), some of it can also be very relaxing and otherworldly: https://www.youtube.com/watch?v=alNEJmGoMvk
You might also find something you like in the world of shoegaze and dreampop (some of which is heavily electronic in nature, but not generally so): https://www.youtube.com/watch?v=tYerbroPX34
Another (mostly synth-based) artist worth checking out is Tor Lundvall: https://www.youtube.com/watch?v=k4cfyI4fdHg