This site gives a nice overview and merges information from several sources: The Funeral Rites of Taungs and later Mandalorian Warriors, http://www.mandayaim.com/a846,The_Funeral_Rites_of_Taungs_and_later_Mandalorian_Warriors
To sum the research: Mandalorians care more about the soul than they do about the body. Some eras considered the body to merely be a tool for improving the soul.
One of the more interesting tidbits: "The kote ky'ram (introduced in Star Wars: The Old Repubic), also known more simply as the Mandalorian death ceremony, was a funerary ritual performed by the Mandalorian culture in ancient times for warriors who died with the highest honor.
Relevant passage from Star Wars Insider 86.
Burial is unusual — Mand’alore and other people of national importance are exceptions — because nomads traditionally had no cemeteries. It’s also impractical to carry dead bodies with the army when men die in combat. Communities cremate their dead if they can recover the body, scatter the ashes, and keep one of the deceased’s possessions as a memorial. This is often the whole suit of armor, which is valuable. In cases where the armor can’t be recovered or kept, parts such as helmets, gloves or buckles will be taken instead. Mando’ade recite the names of dead loved ones and their comrades each night before sleep as a conscious act of keeping their memories — and so their existence — alive.
Relevant passage from Republic Commando: True Colors.
“Sergeant Kal said that Mando'ade use communal graves if they bury at all.” Darman racked his brain, trying to remember what else Skirata had taught them about disposing of fallen comrades. He didn’t care about what the book said about concealing signs they’d ever been there. This was about respect for men who were one simple designation prefix away from being him. “And no soldier wants to be separated from his brothers.”
Relevant passages from Republic Commando: Order 66
Rejorhaa’ruetiise meg’oyacyi jorcu mhi r’asham. Tell the aruetiise that they live because we died.
— Inscription on a Mandalorian memorial to fallen mercenaries, Kyrimorut
Mandalorians didn't have memorials. Nomadic warriors never stayed anywhere long enough to tend cemeteries, let alone public expressions of commemoration. But Mandalore was home now, and Skirata had other ideas.
He hadn't planned it that well. ... they were armor tallies, the last remains of dead clone troops. He was absolutely determined they wouldn't be forgotten. The little tags with their ID circuitry needed to be commemorated, like any piece of armor from a fallen comrade. ...
It was going to be a lot of work. But that was okay. ... A memorial would stand here to make sure that these men were not invisible, not anonymous, not forgotten. ... In his mind's eye, he saw a broad-based obelisk, polished smooth, with the tallies inlaid or names and numbers inscribed. Perhaps that was both too ambitious and too at odds with the unspoiled beauty arount it. It would also be a landmark in a place where he needed to stay hidden. ...
"Only Mandalores have graves," said Vau.
"I'm being an iconoclast. ... It's not enough for us to remember them. It has to be something the whole galaxy can understand. However trumped-up the war was, they still did their duty and died." ...
"So, Walon, materials? Shape? Dimensions?"
Vau looked distracted. "Something that can expand to three million in time. Something that looks like a natural formation from the air."
Remembrance of the dead that Traviss created:
Ni su'cuyi, gar kyr'adyc, ni partayli, gar darasuum.
Loose translation: I'm still alive, but you are dead. I remember you, so you are eternal.
Per its use in the source material, this remembrance is typically said daily for family members and close friends, and on anniversaries of the death of other people who are important to the one saying the remembrance.
This information I'm pulling entirely from relevant Wookiepedia pages.
In Sundari, the Peace Park had a Memorial Shrine, a monument dedicated to those who died during the Mandalorian Civil War. This is where Death Watch staged a bombing. More information: https://starwars.fandom.com/wiki/Memorial_Shrine
A large statue to Tarre Vizsla was erected on Mandalore, after his death. It stood for several hundred years at least. Picture: https://starwars.fandom.com/wiki/Tarre_Vizsla?file=Tarre_Vizsla_statue.png#cite_note-Art_History-6