Sometimes people create a generic title while working on their website’s template — their website’s name, for example — and then re-use the same title across the whole website. This is wrong because it robs each page of a couple of key benefits.
Page title doesn’t just show at the top of the browser window; it’s also shown on the search engine results pages. When people see a list of results on a search engine like Google, they read the page title to figure out what each page is about.
Search engines need different information to rank the results of a particular query. Page title is one of the more important pieces of information they use to gauge how relevant your page is to a particular search term. This doesn’t mean you should load as many keywords as possible into the title — that defeats the first benefit — but you should ensure that each title succinctly describes the content of the page, including a couple of words you think people will search for.
See here:
Blunders
Another recommendation:
Keep your page titles to less than 64 characters:
On their results pages, most search engines use a page's title tag as the first line in a site's description. Typically, Google truncates titles somewhere between character 63 and 67.
In other words, any characters beyond that limit don't appear on the blue, linked title of your search description. Instead, Google replaces remaining characters with ellipses (...).
As a result, you should try to complete your "thought" -- that is, write a compelling line of text -- within about 64 characters (including spaces).
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