Hoochie and Shingles

The image above is a good example of two things. First is how to build a hoochie type shelter, and the second is shelter shingling. Here is some more information to get you started:
Hoochie's:
-Good for one person
-Can be warm
-Can be used without fire to keep it warm in the summer in most places
-Quick to build
-Remember that the bigger the shelter, the more cold air inside it.
-When Y-sticks are not available, you can lash your ridge pole to two trees instead.

Shingles:
-Start from the bottom up in layers across
-Try to find a material that is good for wicking water away(like pine bows).

The Parachute Tipi

Points to know:

-Needs lots of materials to build

-Can be challenging to build with one person because of it's height

-Can have a fire inside

-Good for groups

Image found on google and is from this link.

The Lean-to

Points to Know:

-Is good for groups
-Height of the ridgepole should be to the waist of the tallest person.
-Good for being heated by a fire.

-Not for winter without fire.

-Should be accompanied with a fire wall.

More Information:

The lean-to is one of the most important shelters you will ever learn. It is easy and fast to construct if you have the right materials, so it makes for a great emergency shelter. The firewall should be built opposite to the lean to(on the other side of the fire) to bounce heat into your shelter.

Image from this link.