Tons of question about video games and engines

Question

•1)do we necessarily need an engine to make a video game ? Can you make a video game without an engine ?

•2) Why is Unity so popular ? I heard that it only accepts C#, why is Java so popular ?

•3) which engine accepts Java ?

•4) what is stream ?

•5) how much does game developer earn in a month ? Does it depend on the games he made ?

•6) how to animate and design the characters of the video game ? Do you need an engine for that ?

•7) if you don't need an engine to make a video game , then how ? What are engines anyways ? What are they for ?

•8) can you whoever reading this send me useful YouTube videos or just a simple explanation ?
>~>~>~>~>~>~>~>~>~>~>~>~>~>~>~>
You don't need to answer all these questions , just choose one and Answer is by saying it's number

Thank you for giving me your time to read this ❤️ I appreciate it ❤️

Answer 1

So basically

https://www.sololearn.com/Discuss/625747/?ref=app

Answer 2

Thank you ! Now that's really useful ! ❤️💙