Drop D was one of the first tunings I fell into without really trying to — you loosen one string and the guitar opens up in a way that feels obvious in hindsight and surprising the first time you hear it …
Most open tunings hand you a major chord when you strum all six strings open. Open G minor does something moodier — a full minor chord that’s one of my favorite tunings for anything that needs to feel a little unresolved …
Drop C is Drop D’s heavier cousin — the same idea taken further. It costs a little more in retuning time, but the tone makes up for it, especially once the strings get heavy enough to stay tight …
Alternate tunings change what your guitar can do — different resonance, different chord shapes, sounds you won’t stumble into in standard tuning. This is my running reference: 50 tunings, plainly explained, with where each one tends to shine …