A non-spending budget category tracks money movements that don't actually involve you spending money right now. In the Rocket Money app, these won't.
In Rocket Money, the following categories are non-spending categories and how you can use them:
Tax-Deductible
Transactions that you can deduct from your taxes at the end of the fiscal year.
Reimbursements
Transactions that involve receiving money or getting paid for money that you've spent.
Ignored
Transactions that have been ignored either from your entire app or from your budget.
Transfers
Transactions involving moving money from one account to the other.
Income
Transactions involving you receiving money in exchange for goods or services.
If you want to update a category, here is an article explaining how to edit and create categories.