Painting Outside

The house itself - brick, wood, siding, doors, frames, etc.

Things around the house - stairs, fences, posts, concrete, etc.

Other outside structures - sheds, animal houses, benches, etc.

Use brick paint.

Wood

Use an exterior latex paint or an enamel paint. Latex offers easier clean-up while enamel adds increased durability and performance at a higher price and cost per usage.

See WOOD if you have wood siding, otherwise use the manufacturer's recommended suggestions pending upon vinyl or aluminum siding. Generally, latex is used since siding usually comes pre-primed. If it comes unprimed, use a suitable vinyl or metal primer followed by the appropriate paint type.

Painted doors should use a glossy enamel paint.

Latex paints tend to mildew easier due to its water content and porous nature.

Stained doors should be initially treated with an oil-based stain or varnish followed by at least three coats of a polyurethane for lasting shine and durability.

When installing a new door, it is advisable to make necessary cuts (lock, handle, hinges, etc.) prior to paint/staining. And paint it flat instead of hung, you'll find it makes your life easier.