The code is open-source (https://github.com/pointbiz/bitaddress.org), so you can easily proof, if the seeds are randomly generated. Also there're dozens of recommendations and people that are confirming that the code is trustworthy on youtube and generally in the internet.

Regarding to the concerns about the trustworthiness of my information, because I am a newbie:
I can understand that some newbies that give some guides or "advertise" a website are suspicious, but I can 100% assure that I don't get payed from this website or have any other connections to the website or the founders of it.
I can actually say what I want here, but I hope that in the next weeks and months I can proof my trustworthiness and (how we say in Germany) "die Bedenken aus der Welt schaffen"(Remove the concerns from the world)

(I am sorry, if my English is a little bit "shitty")

Mahlzeit