Test the implementation
Metaprogram against your better judgement
Change your editor's font
Read the stdlib source
Debug at a lower level
Debug at an even lower level
Ask the wrong question as publicly as you can get away with
Re-code the same project over and over
Read a related book
Read an unrelated book
@sakiamu @codefolio if I were to make a free pdf card deck template available would you mind if I included these?