study fundamentals course but also approach core courses
You could give examples to clarify what fundamental courses and core courses are.
I have a little understanding
I used to have little understanding
After four year learning hardly
After four years of working hard. Hardly means "almost not".
an a skillful programmer
I apply general understanding
I have attained a large amount of knowledge
This approach
Do you mean "entering university"?
Beside, studying theories in classroom,
You should omit the comma before "studying"
join in
the experiences they taking part-time jobs
get more different relationships
establish more relationship
attain at university
attend university
build economy for company.
contribute my efforts to my company.