LeesaJohnson

You may join some institute or hire a private german tutor to learn your language . You can also watch some videos to catch the correct accent of the german language, read some books with the help of a dictionary to understand the new words of the german language. 

According to me, it can be good for the beginner learners because they can learn some basics from it but I don't think that you can learn from it professionally. So I will suggest you join some institution where you can be able to learn from professional trainers, they will help you to develop your communication skills as well as the grammar part. You can also learn through online EFL tutor classes which will help you to save your time for travelling to institute.    

That's really nice video to learn Spanish.

I think that first one is more correct.

I would like to share a website which helps in learning various languages http://www.selectmytutor.co.uk/subject/language.html and it is very easy to find a tutor with this platform.

You should keep reading some books to stay sharp.

Actually, it depends on the person that how quickly he/she can catch the language. Some people can learn it just by listening and they catch the language very fast and some are different who can not catch it very fast they need some time to learn it. So we can't say that it is easy or hard to learn Spanish from listening, it depends on the person.