Hi everyone I'm a bit new here so bear with me
I see a lot of people use a custom bitcoin address e.g  1NiNja1bUmhSoTXozBRBEtR8LeF9TGbZBN

I found  that address at https://www.bitaddress.org/
I tried to do it there but I have no clue how to make a similar one
all generated address there are different

Am I on the right path and is bitaddress trusted ?