Collect words ....
Fig.1. How I listed new words in my teens.
This was during A'Level English age 17. I'd done it a bit age 12/13 ... not a big reader, or writer then, I never kept it up. Making lists was one thing, using fancy words quite another. More importantly, as a professional writer the opposite applies: communication is clearest when you use short, every day words, not fancy latinate terms or foreign phrases.
This is a tip three of ten from the Open University and FutureLearn supporting 'Start Writing Fiction' the online course and a Flash Fiction, 140 character Twitter challenge next week.