Technical practices like refactoring and TDD (Test-Driven Development) have become mainstream in software development. However, software developers I met in many companies are either oblivious or have a different interpretation. My interest is to help developers adopt technical practices and being a mentor has played a big part. Through the years I've tried many ways to maximise the effectiveness of mentee's learning and also brings many challenges and discoveries. In this talk, I'll share the experiments I tried and hope it'll inspire you to help others improve their technical practices.