At some point or another, you will create a set of best practices. These are statements or procedures that your experience has taught you that you need to do to get the best, desired outcome. Many companies have these proudly included in a wiki page or document titled "Best Practices". Unfortunately this is not where they belong.

Best Practices should be the basis for your project plans.

Hopefully your project plans are started by using a project plan template. If not, then you should. On this template, your "Best Practices" should be represented. Too many times I have been on projects where the project manager starts by gathing the information about what must be done. Instead, start with how it should be done. Otherwise you will encounter the painful process of trying to apply best practices to a project that is already in motion.