Hot vs. Cold Pressed Paper, What's The Difference?

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Here are the watercolour materials that I use!

Arches Hot pressed paper- CANADA- USA-

Gold Metallic Palette: USA- CANADA:

Paint Palette:
USA- CANADA-

Bee Watercolour Paper: USA- CANADA-

Arches Cold Pressed Watercolour Paper:
USA- CANADA-

Princeton Snap Brushes:
Pack of 4! Sizes 0, 2 and 6 round brushes and a 3/4 angle brush
USA- CANADA-

Size 12 Round brush:
USA- CANADA-

Winsor & Newton Cotman and Professional Paints:
Ivory Black: USA- CANADA-
Burnt Umber (Professional): USA- CANADA-
Cobalt Blue (Professional): USA- CANADA-
Indigo: USA- CANADA-
Turquoise: USA- CANADA-
Prussian Blue: USA- CANADA-
Hooker's Green Dark: USA- CANADA-
Intense Green: USA- CANADA-
Emerald: USA- CANADA-
Sap Green: USA- CANADA-
Dioxazine Purple: USA- CANADA-
Mauve: USA- CANADA-
Opera Rose (Professional): USA- CANADA-
Permanent Rose: USA- CANADA-
Rose Madder Hue: USA- CANADA-
Cadmium Red Hue: USA- CANADA-
Cadmium Orange (Pro): USA- CANADA-
Yellow Ochre (Pro): USA- CANADA-
Cadmium Yellow Hue: USA- CANADA-
Lemon Yellow Hue: USA- CANADA-
Paint Sets: USA- CANADA-

Dr Ph Martin's Bleed Proof White Ink: USA- CANADA-

Prang 16 Watercolour pan set:
USA- CANADA-

Prang 8 Watercolour pan set:
USA- CANADA-

Difference?