Written for Malachain: the essentials, without the noise.
The page title is often the first thing a person sees in search results, so it works like a shop sign. Put the main subject near the start, keep it under about sixty characters so it is not cut off, and make each title different from every other page on the site. A title that promises one thing and delivers another loses the visitor within seconds.
Write the short description beneath it as a plain summary of what the page offers, not a list of keywords. Search engines may rewrite either line if they think another phrase on the page fits a query better, which is a hint that the original was vague. Review titles for your ten most visited pages twice a year and rewrite the weakest one each time.
There is more to learn on this subject, and the linked website goes into greater depth. Treat this article as an introduction rather than the final word, and check any important decision against up-to-date, reliable sources before relying on it.
If you try any of these ideas, start small and adjust them to your own situation. What works for one person will not suit everyone, and it is fine to keep only the parts that help. Writing down what you changed, and what happened, makes it much easier to see after a few weeks whether the effort was worthwhile.
The most useful step is usually the first one. Pick a single suggestion, try it for a couple of weeks, and then decide whether it is worth keeping. Small, steady improvements last longer than ambitious plans that are hard to maintain once everyday life gets busy again.