Software Best Practices Training topics required

Sorry to post this mundane question here, but I need help!

I have to do a 1 hour Software Best Practices Training for some programmers in my company. Audience are Freshers to couple of years experience guys.

Can you guys please suggest some relevant topics I can cover?

I could think of the following:

  1. Importance of following coding standards, indentation
  2. Proper naming of files, variables, functions, classes, tables, columns, views and all other artifacts
  3. Layer your application - each layer must address a specific concern
  4. Abstract common stuff into reusable utility classes

Any help will be greatly appreciated
(A positive response to this post & I promise I will contribute to the community by replying to at least 10 threads!)