Where to use tokens in flows, and how to use them (note that some flows have unique tokens, like the "interesting Moment" flow can have the "trigger.XXX" classes) :
https://community.marketo.com/MarketoArticle?id=kA050000000KyuCCAS-
Interesting Moment
-
Salesforce Campaign Steps (add, remove, change status)
-
Create Task
-
Send Alert
Some other references to what tokens and where in more detail:
The "big" list of most tokens and usages:
https://community.marketo.com/MarketoArticle?id=kA050000000LBvaCAG
Tokens in Interesting Moments (I wish there were more)
https://community.marketo.com/MarketoArticle?id=kA050000000KywJCAS
System tokens:
https://community.marketo.com/MarketoArticle?id=kA050000000LB9WCAW
Creating customer otkens:
https://community.marketo.com/MarketoTutorial?id=kA250000000KysJCAS