Is it possible to add/write your own functions in google maps?

Question

Google Maps

Hello guys! Suppose I need to not only add google maps to the project, but also register my personal functions. Hence I have a few questions.
1) How to do it? If there are good articles on the topic, where to start, where to download the platform, and what does google require for it?
2) What technologies to use? What languages ​​do you need to write your functions in (is it possible in php and js)

Answer 1

Can. Everything is available in the documentation .