i noticed my site www.techtipsmaster.com was on the first page of google for the keywords "tech tips"...but this lasted for only half a day,it came to second page now...what was the reason for that?
It could be due to your backlink published on some high profile social bookmarking site... Naturally temporary
Tech Tips is a very competitive keyword, it would take some time before you reach the top position. I suggest you continue building links using "tech tips" as your anchor text. Create more content regarding tech tips, and wait until it update.
It maybe one of the reasons which caused your site dropped in SERP. I will recommend you to build more relevant backlinks to your site!