If you haven't checked in with the YouTube app for Android or iOS lately, now is a good time to a renew your acquaintance. Among other things, the YouTube app has added such eye-popping features as support for immersive VR videos, a private viewing mode, an easier skip-ahead command, and even the ability to save videos for offline viewing (provided you're willing to shell out some cash).
Double-tap to skip forward or back
Even the most scintillating YouTube videos (and yes, there are some) have their dull patches. Luckily, there's a handy gesture that'll let you skip the lulls and jump directly to the good stuff.