So you've decided to start learning about SEO. I have here a few tips, articles and teams to recommend.
1) Match your titles and tags for relevancy. Use the same and most important keyword at the beginning of your title, as well as somewhere in your tags.
2) Use long keywords instead of single keywords to take full advantage of all 20 characters available in each tag.
3) Even if you are selling similar items, do not use the exact same tags on each and every listing. Add some variety, be creative and treat each listing as a single entity.
Also found those articles very useful:
http://etsy.me/1CHDccrhttp://etsy.me/1yGU9BVhttp://etsy.me/1xT5BXsAn awesome team to join and learn from:
http://etsy.me/1EirUNgHappy studying!