These include the availability of money in ones savings account, tracking money, talking about money with friends, setting clear financial goals, and certain kinds of spending.
Personally, I feel better when I know how much available spending money I have left every month. Even when it’s less than I wish I had, I always feel better knowing exactly what’s left. (And I recently started using the Spending Money report in my Tiller Google Sheet.)
The other practice that brings me peace of mind is diversifying income, mostly through investments. I never want to have all my income eggs in one basket.
For me, it is awareness of my financial situation as stress arises from lack of awareness. Tiller does a good job at allowing me to be aware of where I am at financially. This awareness brings me peace. Awareness, organization, and knowledge regarding my financial situation beats flying blind any day.