Amateur drawings look messy because lines don't connect. A good tutorial will drill you on Endpoint Snap , Midpoint Snap , and Intersection Snap . Once you master snapping, your drawings become professional.
LibreCAD handles linear, aligned, angular, and radial dimensions. A PDF tutorial will teach you how to set the "Dimension Scale" so your measurements look correct on a printed page. Librecad Tutorial Pdf
Unlike AutoCAD, LibreCAD uses a modular interface. PDFs help you distinguish between the Toolbox (drawing tools), Command Line (the brain), and Layer List (the organization system). Amateur drawings look messy because lines don't connect