The lasso tools allow you to select precise areas of an image by drawing or
tracing the selection outline. Tool is located at the top left of the Photoshop Toolbox.
There are three lasso tools available:
This is a freehand selection tool. Click and hold your left mouse button on the image and draw your selection.
Similar to the lasso tool, except that instead of holding your mouse button down to draw, left-click on various points to create a selection with a series of straight edges.
You can also hold down the Alt key (Windows) or Option key (Mac OS) to draw freehand sections.
This is a very handy tool for selecting areas which have reasonably well-defined edges. Left-click at the starting point of your selection and simply move the mouse along the edge.
"Fastening points" are automatically made at various points along the edges. Left-click at any time to add a fastening point manually.
To finish drawing a selection, either click on the selection starting point or double-click anywhere.