The half square triangle unit is probably the most commonly used patch in a quilt block -- well it is second only to the square. It is made simply with two triangles, filling up half the square each -- hence the name. Take a quick look through this website, or in any quilting magazine, and you will start to notice that this half square triangle, regardless of its size, is present in more quilts than not.
Free Quilt Block Pattern
The Garden Path quilt block is an interesting geometric pattern that contains only simple shapes -- the square and half square triangle patches. However, this could be considered to be an intermediate level pattern due to the large number of pieces required to complete the quilt block.
Nothing is difficult about this block other than the need for real precision in your seam allowance so that the pieces fit together. Don't hesitate to try making this block -- just take care with your piecing.
By varying the quilt block setting, and perhaps the number of blocks for your quilt, you can see how this one simple block can create very different quilts.