The polygonal lasso will allow you to makes straight sided selection. Click to set the starting point then click every time you want to anchor the lasso. You can switch to the freehand lasso tool at any time by holding the alt key as we have shown below.
Tip Use the zoom tool to magnify your image while you are making your selections. You may find it much easier to work this way.
Choosing feather will soften the edges of the selection of the lasso tools. The value of the feather will depend on your image size but generally 2-3 pixels will be sufficient.