they believed in immortality of the soul and that when you died you were taken to river styx. the soul then paid the ferry man to cross the river of styx.
Once you were judged, you were either sent to the realm of the heroes, the realm of good citizens, or you were sent to the realm of suffering where you would be tortured by Tartarus until he believed you have served a proper sentence for your crime.
5, Commemoration, once the funeral was finished the person had to be remembered. The roman state gave a set 8 days each year to remember your ancestors and loved ones who had died
To show respect to a deceased family member the romans took at least 8 days out of each year to remember, pray for, and visit the graves of their family and ancestors.