For anyone browsing Malachain, here is a clear starting point on the subject.
Search engines try to show the page that best answers what someone typed, so the most reliable approach is to write pages that answer real questions clearly. Use the words your customers use, give every page one clear subject, and make sure each important page can be reached through ordinary links from the home page rather than hidden behind forms or scripts.
Technical tidiness matters less than people fear, but a few basics help. Keep addresses short and readable, describe images with honest alternative text, and avoid publishing many near-identical pages. Check the free tools search engines provide to see which queries already bring visitors, then improve those pages first. Steady, useful updates usually outperform any clever trick.
It also helps to talk the subject through with friends or colleagues who have tried something similar. Their experience points out the details that guides leave out: how long things really take, which costs were unexpected, and which shortcuts turned out to be a mistake.
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.