I see I would say you don't need to worry about deleting songs you don't listen to much. They aren't going to interfere with the operation of the computer. Just keep an eye on free disk space.
By DDR you mean a hard disk drive? Yes a SSD is many times faster than a HDD, and in some operations (like random access times) they are in a whole different league.
AFAIK it is still the recommendation to leave a certain amount of space unpartitioned for overprovisioning. Recommendations I've seen are normally in the 20% range. That might be a bit high though. This basically helps the SSD to perform it's wear levelling. Here's a more technical explanation from Samsung which is worth reading. If your PC is pre-built, it may already be configured like this, but shrinking volumes is easy to do in disk management. Other than that, just scheduling it to run TRIM every so often (I have weekly optimisation scheduled) will help to prolong it's life.
Some say you should put the swap file on another drive, but personally I haven't bothered. Some also say you should disable system protection (System Restore). It's a matter of preference, but they can be very useful and can get you out of a tight spot if something goes wrong. I've left that enabled too.
Edited by jonuk76, 14 September 2015 - 06:31 PM.