What do the items on an ofrenda symbolize?

Ofrendas used to celebrate Día de los Muertos are made using items that have special meanings with origins dating back to Indigenous people.

Los Angeles Times
#RonniSalt @RonniSalt@ Here's me:
"Rich in #Indigenouspractice, the idea to walk along with me is a generous, deeply personal courtesy being extended to #allAustralians from #IndigenousAustralia
"Come, walk beside me. Come, see me. Come, listen to me
"Please listen." #VoteYes https://theshot.net.au/general-news/voiceless/
Voiceless - The Shot

It may or may not be a well-known fact that the Ulruru Statement From The Heart has a beautifully subtle,

The Shot