My Mac is freezing constantly (30 sec - 1 min) and I am not sure what to do

Question

Hello all,
My MacBook Pro:
-bought it in mid 2012
  -has the OS X Yosemite
-4 gb memory, 2.5 GH.
-Disk capacity: 499.25 GB
        - Used: 499.23 GB
        - Avaliable 19 MB
I am really not sure what to do at this point. Does the freezing have something to do with my disk capacity or is it somethig completely different? Any help would be appreciated. I am college student, so a computer is a MUST for me to have, especially a proper working one.
Thanks,
Jack

Answer 1

First, your disk is not necessarily full. You've activated FileVault or Core Storage. It's normal for a logical volume group to have only a tiny amount of available space as shown in Disk Utility. To see the real amount of available space, select the logical volume nested below it.
When you have the problem, note the exact time: hour, minute, second.  
These instructions must be carried out as an administrator. If you have only one user account, you are the administrator.
Launch the Console application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad and start typing the name.
The title of the Console window should be All Messages. If it isn't, select
          SYSTEM LOG QUERIES ▹ All Messages
from the log list on the left. If you don't see that list, select
          View ▹ Show Log List
from the menu bar at the top of the screen.
Each message in the log begins with the date and time when it was entered. Scroll back to the time you noted above.
Select the messages entered from then until the end of the episode, or until they start to repeat, whichever comes first.
Copy the messages to the Clipboard by pressing the key combination command-C. Paste into a reply to this message by pressing command-V.
The log contains a vast amount of information, almost all of it useless for solving any particular problem. When posting a log extract, be selective. A few dozen lines are almost always more than enough.
Please don't indiscriminately dump thousands of lines from the log into this discussion.
Please don't post screenshots of log messages—post the text.
Some private information, such as your name, may appear in the log. Anonymize before posting.