Create selections with Lasso tool

On the Photoshop on the web homepage, select Upload file and browse for a file on your device.

Choose Select > Lasso .

In the options bar, set the Feather amount.

Drag to draw a freehand selection border.

In the options bar, use Select more  or Select less to add to your current selection or subtract from it as necessary. 

Select More options and choose from the given options:

• New selection: Creates a new selection.
• Intersect with selection: Combines it with the previous selection.
• Anti-alias: Smoothes edge transition.
• Refine edge: Refines the edges to improve the initial selection.

In the Contextual task bar, you can further refine the selection using other options such as Generative fill, Create mask, Adjust, Invert selection, Content-aware fill, or Deselect.