I think it was my Dad that told me that one of his great joys as he got older was the acquisition of new skills, as random and unconnected as they might seem. While working full-time he took three semesters of Japanese, one semester of Mandarin and two semesters of French at a local community college. Then he added in two levels of the Master of Wine designation (the non-trade certificate levels) and the Canadian Securities course. Not for a degree or job but as general interest.
When it comes to golf, the broadening of your skill base can be equally useful. One skill that I learned and which turned out to be in demand was calligraphy. Designing tournament scoring boards with a bit of flair is fun, challenging and ultimately valued by members that want their event to look as professional as possible. (images sent separately)
Whether it’s languages, art or something really obscure, take the time to enjoy learning a new skill. You never know when they might come in handy.