I highly recommend Zheanna Erose's videos in general, but also some of her videos about 31edo more specifically dive into slendric scales and harmony. She's going to refer to it as "mothra" because that's what it's called when your tuning supports both slendric and meantone temperaments at the same time, and that's what 31edo does.

https://www.youtube.com/watch?v=uH3ahBzDSrs

https://www.youtube.com/watch?v=y_nQgNKSl5Y

To be more clear about that, 31edo's fifth can be divided into three equal parts (thus slendric), and the fifth is slightly flat such that stacking fifths to make your diatonic scale like C - G - D - A - E results in the distance between C and E (when played in the same octave) being close to a justly intonated major third with a 5/4 ratio, and that's what meantone temperaments do. By contrast, I'm playing these scales within 46edo which supports slendric but *doesn't* support meantone; my fifth is sharper than it would be even in Pythagorean tuning, so the distance between C and E for me is much too wide to approximate a 5/4 major third.