I get a notice that I am running low on space.
I would the same thing as well. In addition once the above four steps are completed use one of the disk usage visualization tools to find the directories using most space.
Some free disk usage monitor programs for Windows:
Visualize your Hard Drive Usage with WinDirStat
How to Visualize Disk Usage in Windows with Scanner
Recover Hard Drive Space with TreeSize [Windows]
If you're using Linux check the article below.
6 Great Apps to View Disk Usage in Linux
There is a similar app for Mac users as well
Rediscover Your Disk Usage with DaisyDisk for Mac [MakeUseOf Giveaway]
Do a scan and see the amount of free space you will gain, if it looks good for you then buy it.
Search before you post and if you must post without searching, at least tell us what operating system you're using.