Page History

...

This activity, along with the Begin activity. is initial and appears when a new workflow is created; it's a logical conclusion of every workflow. 

If activity

This activity checks a condition to determine if a Yes or No transition should be taken.

https://docs.servicenow.com/bundle/newyork-servicenow-platform/page/administer/workflow-activities/reference/r_If.html

Run Script activity

The Script activity runs a script in the scope of the workflow version.

...