really there are two main benefits of the computer,the first one is regarding computer without internet and the second one is regarding computer with internet.
Fitst:Computer only(without internet)
-Write ur documents or researches(using microsoft word).
-planning ur projects(using for example premavira).
-Translating words from language to another using multilanguage dictionaries.
-Calculation of complicated math equation.
-Graphic work(corel draw,phtoshop)
-Multimedia Direction(Cyberlink PowerDirector,Ulead Video Studio)
-Listening to music
-Medical such as in anatomy
-Civil Engineering such as Autocad,Solidcad,WaterCad
-Mining engineering such as Surface Deformation Prediction Software
-Electrical Engineering (electric cycle programs)
Second Computer With Internet:
1-Connect to many people all over the world.
2Stay up to date with what happening in the whole world.
3-Reading the news,international news,local news,scientific news,sport news,medical news and crime news.
4-Stay up to date with the new technology and information.
5-Study and download scientific researches
6-Manage ur work form ur office or home
7-Talk to person u know and live in another country for free.
9-Buy what ever u need and can't find in local shops.
10-Solve ur problems.
11-Find answers of most common issues.
12-Repair ur car(by share ur problem with others in some forums & many sites provide this service).
13-Stay contacted with new car models.
14-Contact any company in all over the world.
15-Get supported in ur life for most common problem u may experience.
16-Track ur bank transactions,and get information about ur account & account balance.
17-Help people like what we ar doing here now :)
So as I'm an Engineer,the computer & internet is a very very important part in my life...i can't really live without computer.