I need some help with this sentence.

Clubs such as Tresor and E-Werk opened up in disused factories, bunkers and power plants. Berlin Techno took on a harder edge in these brutal buildings.

I am not quite understanding what does "edge" mean in here.

Also brutal building, what kind of building can be described as brutal?

There are 2 sentences I don't know in a video, can someone help me out? I thank you in advance.

In this video, there is a guy who makes jokes and shines shoes.

1:18 he says: "Girlfriend your hell is fine is the boots"

1:32 he says: the shoes fronbley known isn't brown.

1:38 he says: they always at the link? I am 20 made today

https://www.youtube.com/watch?v=yY84Hs64Wj8

Being slicky? or just be myself. I remember that when I was asking my American friend of his opinion on Chinese people a few years ago when we are in Shanghai, he told me a word called slicky. I didn't quite understand what does he mean by that, and he explained to me that it was sort of like the combination of a person who is handy, street-smart, or even a con-artist. It was just a bit of thought from him after we've been trying to get a bargain at the fake market, get a driver's license, get a scooter bike from a local shop, and even an argument on our missing Peking duck at a restaurant and some illegal shit. We did so many things in Shanghai, and my friend is the type of guy who always carries a piece of a gun in the U.S. His hometown was ranked top 3 dangerous cities in the U.S, life is not easy there according to him. I guess he kind of found some similarities of Shanghai compared to his hometown where you either become a guy that nobody wants to mess around or a loser. And the impression of Chinese people to him are just that, hardworking, get shit done, but if you are stupid they will rip you off for sure. Back then, I was always told by my family and relatives that I was too honest, and they always looked at me with sympathy in their eyes, like I will be the one that cannot survive in China. For a long time, I always wanted to be a badass, con-artist, or the character like in God-father. It was my personality that intervene me to be the most dominant or charismatic person in my group, but now I kind of accept the fact that maybe being an introvert is not so bad especially after finish watching the Ted Talks of The Power of Introverts. Maybe I don't need to care about other people's opinion, I just need to accept who I am.

I am trying to collect some writing templates for my writing exam.

There has been a heated debate on whether……… Although some believe that…… I am convinced that……

Firstly, I do admit that….Hence, the reason why xxx that xxx can be seen with clarity.

However, there are numerous reason why…..but the most obvious one lies in the fact that…For example, a recent research conducted by the University of Sydney has shown that…. Furthermore, according to China daily, it has been reported that….

Therefore, it is obvious that….（2个examples）Therefore, it is quite evident why such an idea has garnered support.

To recapitulate/ In conclusion, it is reasonable to say that ….. to some extent……. However, it can still be reinforced that….