If you like to have precise control over the size and position of your windows, you should know some keyboard and mouse controls that allows you to local the window edges to the sides of the screen. You can also use the third-party app BetterSnapTool to supercharge your window control efforts.
You can search for files using the Raw Query function in the Finder. This gives you the ability to use wildcards to search for files with specific file names. You can also use other file attributes and combine them for even more complex searches. Raw Query is also very fast and can search your entire drive in seconds.
Spotlight Search has been completely redesigned in Yosemite from the old Spotlight Menu function. You can still search for files, but in addition you'll get information from the Internet such as movie times, Wikipedia, maps and recommended web pages. You can also do unit and currency conversions and math. File searches can be filtered by kind and date. You can also use logical functions like OR and - (not) to get better results. Find out all you can do with Spotlight Search in Yosemite.