I highly recommend (to everyone here for that matter) the book Clean Code: A Handbook of Agile Software Craftsmanship by Robert C. Martin. It deals specificall

I highly recommend (to everyone here for that matter) the book Clean Code: A Handbook of Agile Software Craftsmanship by Robert C. Martin. It deals specifically with the mistakes you've mentioned in your post, such as hardcoding and naming functions. Great easy read. Cheers