Salams to everyone

Long time ago someone in my country mentioned about progressive Muslims and because nothing more has been said I tried to find infos on my own.And that is how I came here.
I have already read some topics and what I understood is(correct me if I am wrong)
-The Holy Book is the main source of knowledge for progressive Muslims
-Since there are doubts about Hadiths thus they can not be considered as reliable source for Muslims to set as example.

Please be patient with me and try to explain me everything I should know...I think stupid questions are not as bad as ignorance thus by asking I am trying to avoid it.

Thanks in advance

God Bless you all