Inkscape makes it really easy to edit paths. This guide provides a quick overview of Inkscape’s path editing tool (AKA the node tool).
There are four different types of nodes available in Inkscape. Each node is represented by either a diamond, square, or circle (the smooth and symmetrical nodes are both square).
Cycle a node through the four types by control clicking it. If one of the node handles has been deleted, changing the node type will respawn the handle (except for corner node).
control click on a handle to delete it. If both nodes of a handle are deleted, it becomes a corner node.
shift click and drag outward from a node to spawn a new handle without changing the node type.
It is also possible to select node type from the top menu panel.
Use the path tool to drag select multiple nodes in a path:
Invert node selection with shift + !:
Add a node to a path by double clicking on the path with the path editing tool:
Delete any node by selecting it and hitting delete. When deleting a node in a path, the adjacent two nodes automatically adjust their handle positions in order to retain the shape of the path as much as possible. Use control + delete to delete a node without effecting the adjacent nodes.