Don't defragment your SSD drive
Defragmenting your SSD drive is not needed. The storage sectors on an SSD have a limited number of writes and defragmenting will result in many more read/write actions when a defragmentation tool is moving files around resulting in a shorter lifespan for your SSD drive. Mechanical hard disk needs to be defragmented now and then since data will be scattered all around all the platters of the mechanical hard disk. SSD drives simply reads the data from whatever block it resides in. In fact, SSD drives are designed to scatter data around a SSD drive evenly to spread out the wear effect.
Don't wipe your SSD drive
When using a modern operating system like Linux and Windows 7 or Windows 8, you never wipe or overwrite free sectors your SSD drive. This differs from a mechanical hard drive were you wipe or overwrite your disk when deleting data. On a mechanical drive you don't actually delete data but the sector were that data was stored will be marked as deleted leaving the data intact which can be restored by any recovery tool. SSD drives works differently. When data is deleted, it is deleted immediately. The TRIM command makes sure that the SSD drive erases the block were that deleted data was stored so no data will be left and therefore also unable to be recovered.
Don't use old operating systems like Windows XP or Windows Vista
Windows XP and Windows doesn't support TRIM. So don't use them. When under XP or Vista a file is deleted from a SSD drive, both operating systems can't send a TRIM command to the SSD drive so that the data will remain on the disk sector's were it was allocated.
Don't disable TRIM
Don't disable TRIM on modern operating systems like Windows 7 and Windows 8 and Linux. Even when some applications tells you to disable TRIM, don't do it. Leave TRIM enabled at all times!
Don't fill a SSD drive to its full capacity
Make sure to leave a minimum of 10-20% of your full disk capacity to increase writing performances. Filling a SSD drive to its full capacity will dramatically slow down the writing performances. SSD drives fill up empty blocks when writing data on a SSD drive. If there's no space left, SSD drives will read a partially filled block, write that data into a cache, modify the cleared block with the new data and rewrite other partially filled blocks with the data stored in the cache till all data is stored on the SSD drive. This actions repeats itself until all data is (re)written. These actions will decrease its performance dramatically.
Don't write to SSD drives constantly
To increase the lifespan of your SSD drive, avoid constant read/write access. Also avoid writing log files and temporary files to a SSD drive. Configure programs, who writes lots of log files and temporary files, in such way that they write it to a mechanical hard drive. This also means that you should not put SWAP on a SSD drive. Also it is better to put the folder /tmp and /var not on a SSD drive since both folders are frequently accessed. For temporary files you can also create a RAMDisk.
Don't store files on SSD drives which are large and infrequently accessed
SSD drives are smaller than a mechanical hard drive and SSD drives are more expensive per gigabyte than a mechanical hard drive. SSD drives are ideal to store operating systems files, program files, game files and frequently accessed files. So don't store your movie files, music collection, photo's and pictures on a SSD drive since this is just pure waist of an expensive and fast storage device. Also avoid writing temporary files and log files to a SSD drive as explained under point 6.
Never run benchmarks on a SSD drive
Benchmarks write a lot of data from and to a SSD drive, or any other other drive, to test the writing and reading speed of that drive. Although it looks cool to find out how fast your SSD drive is, running a benchmark doesn't do any good to your SSD drive.