[nbz118]

I learned using the Silab's Zero Gecko starter kit that you linked to. As someone whose only other microcontroller experience was a few simple led projects with an arduino, I found the gecko family's tools and docs incredibly helpful and intuitive. It really helped me learned all the ins and outs of the Cortex M, such that I was able to build my own hardware programmer/debugger after a few weeks of tinkering.