Dlang if you want a compiled, next-generation C (low level language) that writes like Javascript but powerful like C, similar to Vlang but imo far better designed and has been around for 20 years. Incredibly easy to get started, and to learn! The docs are great, and the tutorial really outlines and explains how everything works.
Julia if you want a nice scripting language that crunches numbers quickly and efficiently and just ease of development.
"Anything goes in Tcl...except braces in comments"