I rank Microsoft Excel as #1. Still an excellent tool due to its flexibility, ease of use, and widespread acceptance. I am wondering what other programs are useful to know. For example, I hear about the following computer programs: SAS, R, Python, SQL. And I have used JCL with old IBM mainframe computers at a large US insurer in the past. Anyway, wondering if anyone has opinions about which one(s) are most worthy of spending time on to increase one’s skill set. Obviously this will vary from employer to employer. In case it matters, I am an ACAS so property casualty or data science are the relevant areas of work.