I have mentioned before John Fort Paillard's book "Understanding Equitation".
He takes a whole book to describe a dozen or so key terms used in equitation - the study of horsemanship. Find a second hand copy. - the man himself is long gone.
It is very difficult for the amateur writer to describe in words some of the terms used in horsemanship. Much of the time the words used - say 'impulsion', 'contact', 'collection', 'post', etc etc have a specialist meaning when used in connection with horses, so a novice will think they know what has been said or written but in fact they don't. Always keep this possibility in mind. So if you get a reply either written or verbal from an instructor or another writer, then go back to the speaker and confirm that what you understood to be the meaning was in fact correct.
One problem with books written by well known tutors of equitation is that they mostly are not writers, they understand themselves what they wrote but very often the pupil, or the reader, doesn't. Worse, you'll find different people have different ideas as to what a word means.
Some of the article I have written for Horse Forum I have posted on a writing
forum to check how my wording has come across to someone who is not knowledgeable about horses. I have often been surprised to receive a comment like "too much technical jargon" in articles where I had thought I had been perfectly plain in what I was trying to say or write.
Recently I started to read again a book on Msr Baucher, a very famous horsemaster who lived in France in the 19th century. The author who is knowledgeable about horses had translated Baucher's French words into English. I simply can't understand much of what has been written and I am not talking about French words such as "rassembler" and "ramener".
Sadly, there is no short cut to learning about horses. Only time and experience will show you how to handle them, ride them and teach them.
Asking questions, sometimes the same question several times, of someone whose judgement or knowledge you believe to be knowledgeable is the only way to eventually come clear in your mind. Always be open minded enough to accept that maybe you have not yet reached the correct understanding of a technical term.
Try working out what 'on the bit' means and just how do you get the horse to do 'on the bit' and why is it important to try.
What does 'on the forehand' mean? How can you recognize it?
Try explaining to a novice how to 'rise to the trot'
Personally I find that putting an answer in print helps to clarify one's mind.
If then you leave that answer for a day or two and go back and re read your response to the original question, you'll realize just how difficult writing about horses can be.
But that is one of the fascinations about this sport.