C is my primary language of coding. I work in networking industry. So, my suggestions could be specific to this field. I should have learnt more of following (

C is my primary language of coding. I work in networking industry. So, my suggestions could be specific to this field. I should have learnt more of following (a) memory management, (b) process memory layout, (c) good coding practices (d) read up code from other projects. There are really brilliant programmers out there churning out awesome code and that itself is a great teacher. (e) Teaching whatever I learn. Teaching (especially writing it down on paper/webpage) brought clarity to me. Not doing all of the above early in my career is a regret I have now.