Playing more than a little country over my time, I learned the Nashville Number System.
Not tab, not proper notation written out charts, it's a shorthand for working quickly where often you cut three songs in a three hour session. It simply takes the notes of a scale and exchanges them for numbers, so we think of it this way, say for the key of A Major:
A = 1
B = 2
C-Sharp = 3
D = 4
E = 5
F-Sharp = 6
G-Sharp = 7 (and G-Natural would be your 7-Flat)
A = 1 (as it repeats up the fingerboard)
This frees you of thinking in keys, and once it sinks in, it's easy.
On keyboards, there's a BIG difference in playing in C vs C-Sharp !
But on guitars and basses, there are no black keys, so provided you're not backed down to the nut on the first few frets or all the way up to the other end, if you think about it, every song will finger more or less the same. So you think in intervals (1-4, 4-5, 1-4-5-1, etc.) and not in keys, and this takes the mental boogeyman out of transcribing, This is way faster than some device to move things for you which needs no batteries or software updates. Coward keyboard players have that TRANSPOSE button, but not guitars and basses. Plus, rely on that device or software on a money-making job, if it breaks or runs off the rails, you're screwed, right now. D-I-Y with the Numbers, you're always ready to go right now and it can't break.
All you really need to know is what key is the 1, and you're off and playing the tune. In essence you're playing the tune in the new key, all you've moved is the same 'shapes' you were playing up or down the neck. And if you've been a little gun shy about playing up the neck out of your comfort zone, this is a real practical cure that will teach you the rest of the fingerboard. And your ears will have to grow up fast to recognize the intervals. This is all Good Stuff.
Real easy on fives, especially if you wind up playing in horn keys or some not usual keys for some idiot front man.
If this interests you, there are lots of online resources to really spell it out, if you do a web search for 'Nashville Number System' and find one that works for you.