You have to know two things:
1. What is occupying space.
2. Which things can be securely eliminated.
What is occupying space?:
There are some applications which show a graphical guide of disk space, permitting you to quickly distinguish where space is utilized. I use one called Mac Optimizer Pro (which is on the Mac application store) The outcomes are regularly amazing, and illogical. An organizer with a hundred archives likely could be littler than a solitary film.
What can I securely eliminate?:
On the off chance that you discover an envelope loaded with motion pictures, which you needn't bother with, at that point you can erase them. However, the system regularly makes caches and duplicates which are more subtle. For example iTunes reinforcements of iOS gadgets are enormous, yet can be securely erased (giving you needn't bother with them).
In the event that you locate a secretive tremendous envelope, it's a smart thought to watch online to discover what it does and build up whether it very well may be securely erased.
The iPhoto and iTunes libraries are frequently enormous space swines. You can move these to another drive and let loose the space. I have a Nifty-Drive introduced in the minimized glimmer opening. It has a 128GB drive in it, which has my photograph and iTunes library."Have these two applications, your Mac will keep clean and well-being certainly."