When learning the basics of Music Theory and particularly when applying them to the guitar, it is a good idea to do so in a "Key of the Week". For example, it is easier to learn the Diatonic 7th chords in one key-- for a whole week, instead of tackling them in all 12 keys at once ! Same thing with learning scales, diatonic Triads, etc... Once we are comfortable in one key, we can understand how things work and how they can gradually be transposed to other keys.
I still switch keys every week-- on Mondays, as a matter of fact... If I practice a line, an arpeggio, or any type of exercise in all 12 keys, I start it in the "Key of the Week", and then go through the other keys (usually in 1/2 steps or through a cycle of 4ths). Why always start in C ?
There is a lot more to that "Key of the Week" concept: we can also use it when working on transposition. If I'm in a transposing mood (it does happen every now and then...), I will play a few Standard tunes in my "Key of the Week". If anything, though, I do make sure to play through a Blues progression and through "Rhythm Changes" in that key, at least once a week. Turnarounds (with all kinds of variations) should be practiced in the "Key of the Week" as well -- comping and soloing ad nauseam.
If you feel intimidated by the idea of transposing tunes from memory, try some very simple ones at first: "Summertime", "Mack The Knife", "Autumn Leaves", "Take The A Train", for example... and yes, you do have a full week to figure them out !
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