Lots of good options exists that have dual purposes: illuination + safety. This includes floodlights, wall lights, bulkheads, lamp posts etc.

I recommend floodlights - these are brilliant to provide massive lighting.

Also I have light in my deck which are good for night dining and sitting outside.

I definitely recommend outdoors lighting centred around security.

Choose the darkest areas of your exterior and where thieves can enter.

Apart from illumination and security, safety os also a major consideration - like stairs, pools and places where you could trip easily.

Agree, outdoor step lights are absolutely critical. 

I like path lights and driveway lights, and there are many types for all sorts of tastes. 

Don't forget that outdoor lights can make your home beautiful! Lights like driveway lights, entrance lights and wall lights can significantly enhance the appeal of your home.

Consider adding a motion sensor to yoru outdoor lights. This will improve your safety and conserve power as well.

Outdoor lights can be very expensive, do make sure your use LED globes and ideally with motion sendors if possible.

Consider underwater LED pool lights and pond lights. Simply gorgeous effects.

Outdoor lighting is actually an art form - whatever your need is, always use a professional to design it.

Woudl definitely recommend, likewise, solar lights. They have changed my life around!

Something that is often neglected is your keyhole! When you come home at night, you need good lighting around your door to be able to open it with your  key.

Consider using what is called a 'wall wash' which is aiming a wide angle of light at a wall from a short distance.

Good outdoor lighting can dramatically improve your entertainment capability! For thing like BBQs, outdoor parties, having friends around etc.

Highlighting trees can be great as well.

NOT lighting some items outdoors can be just as important as lighting items, because it can take the focus away from ugly things such as sheds.

Good outdoor lighting can add huge value to your property.