I want to create application by my own source code.?

Question

i want to create application by my own source code so that I won't have to rely on any websites to make my app

Answer 1

my Question is
if i create an app by my own source code then only i will have the copyright or the place I'm publishing it will take any credits??

Answer 2

by learning JavaScript can i create an app or do i have to learn something else too

Answer 3

for books
and games too