Lead by Attila and his descendants the Huns were one of the most successful civilizations of their time militarily, finding victory even over the Roman Empire and building an empire that stretched from southern Russia and Iran all the way to what’s now France. Attila even gets referenced in the Volsunga Saga of Norse mythology.
The success of Attila and the Huns obviously can’t be boiled down to a single factor, but the one that gets referenced the most is definitely the skill of their horsemen.
Like the Mongols centuries later, the popular legend is that the Huns learned to ride horses before they even learned to walk. They were claimed to live almost their whole lives in the saddle, and as a result they became some of the most expert horsemen that the world has ever seen.
While nowadays you probably don’t need to master your horsemanship, we can apply this same principle to get exceedingly good at any other skill you want to master.