Students and educators get real AutoCAD (and Revit, and Civil 3D) free through Autodesk's education program. If the goal is a job in a European studio or engineering office, that beats every alternative: ads name AutoCAD and Revit, not LibreCAD. Learn the real tool free while you can — the open-source options above are what you keep using when the .edu address expires and you're drafting for yourself.
A lot of "free AutoCAD" searches are really "learn AutoCAD for a job". The free routes that hold up: Autodesk's own learning paths and tutorials (the same material behind their paid certification prep), the education license above — which gives you the real software to practice on, not a simulator — and the deep bench of project-based YouTube courses. What to skip: third-party "certified AutoCAD course" sites selling certificates studios don't recognize. On a European CV, "AutoCAD" is proven by the portfolio drawing behind it, and the only certification with real weight is Autodesk's own Certified User / Professional exams — which you can prep for entirely free.
The jobs angle: pure-AutoCAD drafting roles are fading in Europe; BIM is where demand concentrates — see live BIM & Revit openings and the salary calculator for what the switch is worth.
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LibreCAD and QCAD Community for open-source 2D drafting, FreeCAD if you also need 3D or parametric modelling, and the Autodesk web apps for quick viewing and markup.
Mostly via conversion: LibreCAD and QCAD Community are DXF-native, so the reliable free route is converting DWG to DXF with the free ODA File Converter. QCAD Pro, a cheap one-off license, adds direct DWG read and write.