A few points to remember

The following are some noteworthy points to remember:

• You can't evaluate the next criteria if a criteria group contains scheduled actions.
• A DML operation on a setup object is not permitted after you have updated a non-setup object (or vice versa). If you want to do that, then use a time-dependent action. You can find the list of setup objects in Salesforce at https://developer.salesforce.com/docs/atlas.en-us.api_tooling.meta/api_tooling/reference_objects_setup.htm.
• Don't perform the DML operation inside the Loop element. It will easily hit the governor limit - that is, System.LimitException: Too many SOQL queries: 101.
• You can only launch Autolaunched Flow from the Process Builder. 
• A Flow runs in user mode, and Process Builder runs in the system mode. Let's look at an example if you are trying to update Opportunity the next step:
  • If you use Process Builder: If the running user doesn't have access to the next step field, Process Builder will be able to update it.
  • If you...