I found this list pretty decent, and definitely things we should all be aware of as our networking careers grow.
1) ALWAYS TRIPLE CHECK EVERYTHING. Make SURE things work by verifying.
2) Never assume anything
3) Never be confident in yourself in anything. Question everything you do even if you know it
4) Listen to other people and ask for them to sanity check your work
5) Whatever you do, keep it stupid simple. You're not the only one using the network
6) Don't be afraid to re-evaluate everything you think you know every single day
7) You know less than you think you know
8) Don't trust documentation unless it's simple and straightforward
9) Never stop learning more
10) Learn operating systems, and linux usage/administration specifically
11) Be nice to people, even if you want to beat the ever living daylights out of them
12) Learn to use Excel, Notepad, and scripting. It will save your work life. Pick a language and stick to it
13) Bleeding edge technologies might sound interesting and cool, but they rarely pay the bills. Learn consistent, simple, straightforward engineering
14) Use the right tool for the right job. Not everything is a hammer, and not everything is a nail
15) All vendors are shit. Some are less shit than others. No vendor does everything well
16) Be flexible in the technologies you know and how to apply them irrespective of vendor
17) Learn how TCP, UDP, IP really work. I mean, REALLY work
18) Learn how to use Wireshark. Take a class if you need to
19) The network you work on is not yours
20) Your work is NOT necessarily representative of your skills. A shitty network doesn't mean you're a bad network engineer. A good network doesn't mean you're a good network engineer
21) Be demanding, but be fair
22) Admit if you messed up
23) Slow down
As taken from a comment in:
https://www.reddit.com/r/networking/comments/5ljq7j/what_are_your_networking_pro_tips/
