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.
How To Sew Buttons And Buttonholes On A Shirt The Easy Way
Round-Up of Shirt-Making Resources Online
Button Placement - Threads
Work in Progress, - Page 2 of 3
Shirtmaking: Button Placement & Buttonhole Tips
Pattern Drafting A Buttonhole ~ Learn How To Create A Buttonhole
Liam: Shirt Placket Tips and Tricks (Mistakes I've Made So You Don
A Sleeveless Granville Shirt
Gamechanger tips for sewing buttonholes - Elizabeth Made This
The Shirtmaking Workbook – Our feature and a giveaway! (Giveaway
I Made it Work Line of Selvage
Sew Alongs and Tutorials