I just got user .
Was very tough but was worth it .A lot of manual work. I will not give you nudges because the exploitation is awesome and we should struggle .
For the initial users yes i can give a good article which can help for the overall exploit .
But finding the real user was insane and beautiful : )
I struggled so much but when i found it was super proud of me . Was so so cool …
Now onto root …Lets see if i will struggle again 
most probably yes : )