Multiple Questions Regarding Coding

You should look up some java tutorials for beginners. Just follow those until you have a better understanding of the language and then set a project for yourself to try to complete that you think is within reason. Try using eclipse as your ide as well.

Udemy is a good choice. Courses often go on sale there for just a few bucks, and there are many good free courses too.

I suggest you get start with Python programming language, it's has a great community to support. To begin, just start with the docs, read the tutorial and try some example. you can ref to the docs at https://docs.python.org/3/tutorial/index.html . hope this help

First you should choose which language you want to learn. I would recommend python and it is intuitive yet very powerful. Find some free tutorials through google, there are countless high quality ones. Then start a simple project from there, use google every time youre stuck