Photoshop Question.

I feel embarassed for asking this but, how do I resize images/renders in Photoshop. Along with that, how to I make the whole image window smaller. I mean like making the whole 'box' go from 100 x 100 px to like 50 x 50 px.

Thanks.

To resize an individual layer:

Edit -> Transform -> Scale. Hold Shift + Alt while resizing to keep the proportions and centre point.

To resize the entire image, including all layers within it:

Image -> Image Size. Click Constrain Proportions, and change the values.

To resize the image without resizing the layers within it:

Image -> Canvas Size. Click Constrain Proportions, and change the values.