How to easily find the error's & solved it?

Answer 1

Just go line by line and find your error.Need a lot of practice and great knowledge.Always use dry run on your code.First write on copy and then computer.Read every line of code properly. In such a way you can find your error easily.

Answer 2

you can always place breakpoints when debugging, depends on your IDE tho.

Answer 3

you can also write log messages so when it gets past a certain point you can say, "successfully created.." or something like that, be creative