This is something I've struggled with as well. Over and over. Particularly with aligning cylinders.
While you can do it quickly, you've had a lot of background experience with the product. :-)
I think discoverability isn't the solution. I think simplifying the process is.
Being able to pick the axis of two components and simply telling it to align (horizontal, vertical, left,right, top bottom or a combination) seems like a simpler solution. Even if done with bodies.
The videos I saw gave many solutions.. but I'd kill for a simple one (no actual murder implied. :-)
I've added my tuppence worth, I'm sure there must loads more content in the crash reports section and a shout out to the developers who might have sent other users videos and users who know of or have links to other helpful bits as I'm noticing how fragemented it all is between You Tube, Jing and even Facebook,
just wondering too if might be helpful to Sticky it to the Using Autodesk Fusion 360 Beta rather than the Getting started as I think some of the tips are beyond basic starting and the requests for more general help appear to be posted here