I have been doing SEO for over 15 years and have forgotten more SEO information than I care to admit. I often discover I have forgotten a trick when talking to a newer SEO who tells me about their "new Google trick" which then reminds me about what I used to do.
Talking with newer SEO people is a good refresher course for me. Even when they don't share a "new idea" their fresh approach to questions can help me see problems from a new angle making it easier to solve.
What Google SEO newbie information do you think veterans should remind themselves about?
Here are two quick ideas that come to my mind:
A) Our visitors are humans and that means they change over time. Search terms, user behavior and much more will change. You need to change or you will end up on the sidelines watching everyone pass you by.
B) If your site is not fully functional and free of technical glitches, you will have problems. When was the last time you checked your site for broken links, missing title tags, blank pages, 404 errors, etc. ?