compass constructions
Skill #1. Copy a segment
https://www.mathopenref.com/constcopysegment.html
Skill #2. Find midpoint of a segment
https://www.mathopenref.com/constbisectline.html
Skill #3. Copy an angle
https://www.mathopenref.com/constcopyangle.html
Skill #4. Bisect an angle