Okay so just because it happened today, a friendly tip/reminder/hint:

If your friend has a horse or multiple horses, please don't ask if you can come over and ride it or get a lesson on it.

For one, your friend probably isn't qualified to give lessons and as someone who's been riding for almost 20 years and has ridden a decent variety of horses, not every horse is qualifed to give lessons. You could get seriously hurt, or hurt the horse.

Secondly, it's kind of rude and assumptive. Are you going to ask your friend "when are you going to invite me to your house to play in your pool?" or "when do I get to come over and pet your dog?" before they invite you? Are you going to ask them when they're going to make you dinner?

Thirdly, you probably don't know the horse. You don't know the training on it. You don't know how old it is. You don't know if it's got traumatic history. Does your friend even ride their horse, or is it a companion animal? Maybe it's had an injury that keeps it from being ridden. Maybe their horse is old. Maybe it's young. Maybe it has training in it's youth but has been sitting for a few years. Maybe it's got quirks, like you need to leave it's mouth alone or if you put your feet in the wrong place it rears. I've known horses who went backwards because someone who didn't know what they were doing got on them.

If you're invited out to ride or pet or interact, that's fine. I've invited a different friend out, purely because she's been around horses before but not taught the proper way to interact and she wants to learn how to handle them on the ground before riding. But don't invite yourself out, or ask when you get to come ride. You don't know the horse, and you don't know the circumstances.