Step by step trouble shooting guide?

Dear all,any step by step trouble shooting guide
I already install maas 3.6 via snap.
when I commissioning a machine,failure
any step by step trouble shooting guide,for example
1,how to chek some failue logs
2,maas dhcp ,tftp,service ok or not
3,ip allocated or not
4,pxe failure detail logs
5,client pxe setup ok or not
6,tftp some file ok or not
7,image exsites or not
I just know commissioning failure,but can not check it step by step
very thanks