Better understanding of Ubuntu! [closed]

This is a very broad question so I am going to give you a broad answer;

The internet is your answer. We can't tell you what you need to know. You need to figure out what you want to know and try to find the answer online or ask it here. if you want to know how 'X' communicates with 'Y'. I would say; google it!. "how does X communicate with Y?"

Some keywords I found interesting things on are; Ubuntu tutorials, everything you need to know about ubuntu, becoming in expert in ubuntu. There is also many useful content on youtube. Other websites you can take a look at; Udemy, Skillshare, Coursera and Udacity.

You can also take a look at the answer from @N0rbert in this topic