Also see:
What is Nirvana?
Great Resource of Buddha's Teachings
The Deathless in Buddhadharma?
The Meaning of Nirvana
 

https://www.reddit.com/r/streamentry/comments/igored/insight_buddhism_a_reconsideration_of_the_meaning/?utm_source=share&utm_medium=ios_app&utm_name=iossmf%20

[9:07 PM, 8/27/2020] John Tan: Yes pretty much agree with what he said.
[9:40 PM, 8/27/2020] John Tan: But the same insight of anatta must be applied to object, characteristics, cause and effect, production and cessation...which is a more slippery issue.  Nevertheless, experientially seeing through self/Self is still most crucial.