you cant build the house on a sandy foundation so the saying goes. I am not sure who said that but it makes sense you cant build a 100-floors building on shaky foundation. The same is for your security career. You need to have the basic foundation for whatever path you choose whether being a pentester or a GRC consultant.
From Pentester’s view, you will need to understand how the computer, networks, applications, storage and cloud works at very rudimental and fundamental level. the good pentester is a crafty penetester just like an artist, picasso? Tools will help you but thinking in and outside the box is needed, that is only possible if you have the fundamental and know how the machine works.
That’s been my approach in my career and i could see some progress since when i started back in 2007. Know the fundamentals and keep yourself updated.