This node will allow you to start multiple tasks at a time. Selecting the upper node and clicking on the 'Plus' icon will always add a new branch.
Then you can add tasks for each branch separately by clicking on the needed task on the branch, then on a plus icon.
You can add a task after the parallel, by selecting the lower node and clicking the plus icon.
Keep in mind that the parallel node will be completed only if all tasks inside of it are done.