I learned that on my own some years ago (long before the internet). It was a revelation to finally get that issue solved. Come to think of it, it's probably why I grew a mustache and wore it for 30-35 years.I don't watch shaving videos. I have read a ton here, and maybe watched a few videos linked from here, but not many.
Since I started DE shaving about 6 months ago, I have struggled mightily at getting those whiskers directly below my nose/nostrils. When I used carts, I would just shave my upper lip north to south, the flip the cart over and use the single edge on the back to clean up under my nose, again just going N-S.
With DE razors that is very ineffective, if not impossible, for me.
Last week I made a discovery: If I use the corner of the razor almost IN my nostril and go XTG (east-west) I get em all. Hallelujah!...a true revelation...and it only took me 6 months to figure it out.
I'm blaming you guys for not telling me.
Of course you are welcome to counter that I just wasn't paying attention.
Anyway, good for you for figuring it out, especially being new to DE shaving. BTW, one razor I own that I can't do that trick with is the 195 "Fatboy". Too big a head. Easiest has to be ball end Techs and similar.