The title of your web page carries the most importance with search engines. Don't waste this by using something like "Home"! The title metatag should be below 60 characters and include your most important keywords first, if you have a company trademark or trading style then you might want to add this to your description and keywords list too.
This tag is often used by search engines to obtain a description of the web page. It may not affect your ranking, but it is the description that search engines such as Google put in the ...