OPSEC is NOT a collection of rules and lists, and the process is not one which can be summed up in a few bullet points, although it's not uncommon to see this tried. The process and the mindset of OPSEC must be considered and applied in order to realize the full benefit.
With that said, a few tips or reminders may be applied in order to fully utilize the concepts:

• Get in the habit of constantly considering OPSEC in all phases of an operation, especially planning. This helps to ensure that critical information is best protected at all times.
• Take advantage of freely available OPSEC training to supplement the annual requirement. The adversary doesn't wait until the year-mark to change their operations, and we shouldn't wait to protect our own.
• One person's trash is another's treasure! Be very careful about what's thrown in the trash, and shred, if possible, anything that's potentially sensitive. In many cases, trash, once it leaves your control, is essentially publicly available.
• Consider the 'OODA Loop'- Observe, Orient, Decide, Act. We do it, and our adversary does as well. By protecting critical information, the adversary is forced to spend more time planning before they can act, increasing the chance that their actionable intelligence has grown stale by the time they can strike.