Corners are not matching on my first quilt!

[runr0bin]

Please help out this newbie I’m working on my first quilt and loving it, but my corner seams aren’t lining up. tried pinning carefully, but they still shift. Any beginner tips?

 

[Alan]

What helped me before was double-checking my seam allowance, make sure it’s a consistent 1/4 inch., Also, pressing seams before joining blocks made a big difference.

 

[Jillian]

At what pint are you in the quilt process?
Are you sewing blocks together or is this the backing not meeting at the corners?