Where can I learn huapango or traditional sones online?

The most important thing is that you look for specific YouTube channels from Mexican teachers who teach these genres, because most people who try to learn that way end up copying movements without understanding the rhythmic structure, and that doesn't work in the long run.

There are several places you can get into. YouTube has pretty decent channels from traditional musicians who teach step by step, both for guitar and dance. There's also Udemy, which has some courses on sones jarochos and huapango, though the quality varies quite a bit; I'd say you check the comments carefully before paying. If you're looking for something more structured, some online music schools (there are several based in Mexico) offer private or group classes over Zoom where a teacher actually corrects your technique. What I'd recommend is starting with free YouTube to see if it really hooks you, because it's easy to buy a course and then never use it.

The important thing is that these genres have a lot of oral tradition, so seeing someone do it well is fundamental. It's not the same reading about huapango as seeing it live or in video. Plus, a lot of these rhythms have variations depending on the region, so you'll probably end up mixing styles from different parts of Mexico. That can be fine for learning, but be aware that if you want to be more authentic, you need to focus on a specific tradition. Also consider joining communities on social networks where people who play this stuff share; sometimes the best help comes from other learners who've already gone through the same thing.

Don't look on generic music platforms because they almost never have instructors specialized in traditional Mexican music 😅 your best bet is YouTube, where there are channels dedicated to sones jarochos and huapango with people who actually know their stuff, or if you've got the budget check out Udemy and Skillshare since sometimes you find courses from Mexican teachers. It's also a cool idea to look for cultural groups or regional associations that sometimes offer online classes, especially if you can find someone from Veracruz or Oaxaca since they're the ones who really know these rhythms.