How I can change a made program?

Question

I want to change some program. and breaks there coding

Answer 1

what program? you can mess around with the source code of a website, if you want to modify an android app you would need to decompile the classes but I guarantee you this won't work out unless you're an expert (experts wouldn't probably decompile classes to change something because the code will be very hard to read and understand after that - variable/function names and comments would be gone)

write your own apps or download the source code from the internet if you find something(take a look at some open source projects)

Answer 2

yes I know but I want to see the big program logics and how to make a program. I have read 4 programming language but I can't make own program because I don't now to arrange big program using lot of logics loop and functions.