Left to right
Flowcharts are very well known. Mostly they are modelled from top to bottom. BPMN 2.0 flows are built from left to right.
Pools and Swimlanes for roles
BPMN 2.0 shows who does what and when. The graphical elements Pool and Swimlanes show visually which roles and activities are performed under which conditions. Pools and swimlanes are not relevant for process execution.
The BPMN 2.0 standard provides various task types for different purposes.