If you let yourself be undisciplined on the small things, you will probably be undisciplined on the large things as well.
Another thing I think should be avoided is extremely intense ideology because it cabbages up one's mind...when you're young it's easy to drift into royalties and when you announce that you're a loyal member...and you're gradually ruining your mind.
The energy transition is not just about switching fuels; it's about transforming entire systems and mindsets.