Welcome to the Forum.
"Care" of a horse can mean many different things to many people.
From riding care, to barn care, to feeding care, to exercise care...
The list is pretty extensive.
You though make it sound like internet courses are not where you want to be, so thinking hands-on tutelage in things like riding is more where you want to be...
As others offered, if school age look into 4H, after-school clubs and constructive activities school related through FFA, 4H and your local Ag departments.
If in college, there are riding clubs official and just groups of individuals all who do horse as a common like together. Look for that.
For feeding knowledge gained, most feed stores if affiliated with large companies do seminar group setting of the how-to-do with of course emphasis on the products offered by who is giving the seminar.
Continuing adult education courses can offer programs on horse health, care and some do riding principle for beginners based at a lesson barn.
Girl Scouts have a badge you can learn a lot from by doing and being taught by "leaders".
Vet & farriers can offer a wealth of information and knowledge, resources of where to get more in-depth help in your area to learn.
Reading, reading books and articles from respected professionals can offer a lot of insight...applying book to real life experience though...you need a barn and horse only you know where they are in proximity to where you live.
Keep looking and don't get discouraged seeking information.
Go to local feed stores and read the community bulletin boards, talk to store employees..they know all the dirt on the local where to find this or that...
Go to a local tack shop and talk to the store employees...ask them if they know and can offer suggestions where to find...
Again, a wealth of information can come from many which is concentrated for your area and easy to get to in the local store.
Now you have joined here...ask questions, read old threads on subjects of interest to you.
Basic information is basic information to be built on, a strong foundation comes from using many resources to give you a better understanding of your topic. No one
here gets down on someone for asking questions they not know answers to...
So many here are knowledgeable and offer to help so you/me/we understand better and are better stewards caring for our horses. No question is ever dumb, the dumb question is the one left unasked and answer unknown about
... Remember that.
And finally, if you get a rude/nasty response to a question you ask...there is a small triangle left side bottom of the post you click to report it.
Leave a few words of what is wrong and the moderators team will take a look and do what is needed as they help govern the rules of posting on this forum all must abide by. Again, WELCOME...