Watch it below to learn these.
The standard seam allowance is 1/4 or rather a scant 1/4.
you could use a 1/4 presser foot which most often times comes along with your sewing machine.

Image credits: Art Gallery Fabrics via Youtube
#2 Be patient and press
Pressing your fabric does matter.
Pressing all your seams as you go as well is quite important to achieving a finished quilt top.
To press your seams, you have two options.

Pressing seams open or to one side.
Dont rack your blade back and forth to cut your fabric.
Use a rotating cutting mat when trimming blocks.

To trim your half-square triangles, line the diagonal line on the ruler with the diagonal seam.
Hold your ruler firmly and trim two sides.
Rotate your mat and trim the other two sides.
It also saves you a lot of thread.
Fabric marking pens are a game changer.
Small sharp scissors are perfect for clipping your thread as you sew.