Reference

Complete and lookup-shaped. If you want to be walked through something, the tutorials and how-to guides are the better door.

Drawing

Tools	All seven drawing tools and the view control, with exact click sequences
Keyboard shortcuts	Every binding, in one table
Constraints	All eighteen, with the selection each one needs
Constraint badges	The glyphs on the drawing, and what a click on one does
Expressions	The arithmetic every numeric field accepts
Parameters	Named values that drive dimensions, extrudes and blends

Panels

Selection section	Select modes, point fields, constraint actions, picks
The document tree	The panel on the left, its six groups, and what sits outside them
The Configure panel	Exposed parameters as controls, and the part's mass reading back
Constraint docket	Row anatomy, the four states, editing and highlighting
Timeline	Sketch, extrude and blend rows, the rollback marker, export, stats
Bodies	The list of solids, per-body visibility, groups, and the boolean picker
Joints	Holding one body against another, and the two numbers that drive it
Status foot	Profiles, activity, and the degrees-of-freedom row

Solids

Extrude	Depth, add and cut, midplane, and when the button is disabled
Revolve	Turning a profile about an axis, and what a turn will not fold into
Offset	Growing and shrinking a shape, the tolerance field, and shelling a box
Mirror	Reflecting a body in a plane, the four operations, and what the seam costs
Pattern	Copying a body along a line or round an axis
Construction planes	Datums to sketch on: offset from a face, halfway between two
Text	The text form, the fonts, and what a document saves of them
Blends	Chamfer and fillet parameters, reach, and every refusal
Model view	Navigation, view buttons, X-ray, and what each select mode picks

Data

Saved files	What a .slop.json document holds, and what it does not
Import dialog	Every control in the importer, both doors
Export formats	STL and OBJ, and what is absent

Terms

Glossary	Entry, feature, part, body, profile, docket, reach, rim

Conventions used throughout

Every length is in millimetres and every angle is in degrees. There is no unit setting, and no way to work in inches, though the expression parser will happily convert for you if you type 25.4 * 2.