A line is a shape that connects two or more points. It can be fat, thin, wavy, or jagged—the list goes on. Every possibility gives the line a slightly different feel.
Line
http://www.wcs.k12.mi.us/cousino/wcsart/art%20foundatons%20site/line.html
Curvature Pen tool - https://www.youtube.com/watch?reload=9&v=OAlbJDQ7Bfc
https://www.photoshopessentials.com/basics/use-curvature-pen-tool-photoshop-cc-2018/
Bird Template - https://drive.google.com/file/d/1Oj3r-o2Ian7RYu_ZTsUfaWOgdrQoMCa8/view?usp=sharing