Before moving to minor triads - should we memorize all of the major triads on the fretboard?
I would suggest memorising the major triad shapes in root, 1st and 2nd positions all over the fretboard first, make sure you know where the R 3rd & 5th are. Once you know this all you have to do to get to the minor triad is to move the 3rd down one fret closer to the nut/headstock.
If you are also working on knowing where the notes are on the fretboard at the same time then you will know where every R is for every triad major and minor.
Cam Crawford
George Mattingly
Samuel S
Michael Watts
Here is Tomo's comment:
"Thanks so much for subscribing to my Guitar Wisdom. Please do not memorize Major triads. Try to become familiar with them slowly… then, when you can play them comfortably, you can move on to the next thing. This approach can apply to other lessons as well. So, take your time! Watch each video several more times, and you will notice something that you missed before!"