TUTORIAL #1 : Make a png (a picture without a background)

STEP 1: Open the photo you want to make on a png file in Photoshop.

Take the Laso Tool.

STEP 2: Compass the figure you want to cute, without without releasing the mouse .

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STEP 3: Go to Edit > Cut (or Copy) 

STEP 4: Make a new file  (File > New) . Then go to Edit > Paste and remove the background.