Here's how I like to get the buttonhole placement on a shirt just right, tips on sewing buttonholes and a tutorial link to how to sew on a button.
Shirtmaking: Button Placement & Buttonhole Tips
The Correct Position of Buttons and Buttonholes - Designer Stitch
buttonholes
Liam: Shirt Placket Tips and Tricks (Mistakes I've Made So You Don
4 Positioning Points for Perfect Button Placement – The Daily Sew
If you are looking for a more interactive version of this Skill Building Session, consider checking out my free online community: Sew Sew Guild. There
Buttons and Buttonholes Skill Building Session Bundle
shirts
Shirt Making 101 with TomKat Stitchery
Sewing A House (or Tower) Tailored Shirt Placket
Diary of a Sewing Fanatic: Shirt Sewing Tips
Round-Up of Shirt-Making Resources Online
Shirtmaking: Button Placement & Buttonhole Tips