The official English manual can be found at: librecad.org → Documentation → "LibreCAD User Manual PDF"
Linien, Kreise, Bögen, Polylinien, Splines. librecad handbuch deutsch pdf
The story of the LibreCAD Handbuch (German PDF) is a classic tale of open-source community grit, where the "missing piece" of a great software project was eventually filled by dedicated users and professional third parties. The Problem: A Software Without a Map For years, —which branched off from QCad in 2010 The official English manual can be found at: librecad