Cathedral quilt blocks can be quite tricky to do, especially when you are new to quilting.
These straightforward methods will make you understand how to do cathedral blocks easier.
Watch the video tutorial below to learn these two easy ways.

Image credits: Quilt Stories via Youtube
Do the same to the other two squares.
After sewing, iron the stitches on the back side and sew them all together.
After this, fold the white fabric toward the colored fabric and sew it.

Do this to all four sides.
Your cathedral quilt block is now finished.
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Method 2
For the second method, you need 4 pcs.

Fold the first fabric in half and sew both sides.
Iron the fabric to smoothen it out.
Now, fold all four corners toward the center and pin them to secure.
Repeat this process to the 3 remaining 1616 square fabrics.
when you’ve got 4 pcs.
of fabric all sewn up, lay them down in 2 rows, forming a big square.
Attach these all together and stitch them from corner to corner.
You now have a 15.5 x 15.5 square.
Pin them to secure, then fold the white fabric sides toward the colored fabric and sew it.
Your cathedral window block is now finished.