Buy a book ! Quickstart guides are only about 20 quid (Peachpit Press).
This tool exists in version 7 of Photoshop (I looked in my book!). Load picture, select tool, click on area not wanted, selects "like" colours and forms a boundary, press delete, you can adjust sensitivity to colour etc. I "inverted" picture deleted all the black and inverted again.
Good luck
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