The OpenOffice 3.0 Guide for Writer is really useful. With 548 pages it is more a book, than a tutorial, nonetheless it is written in tutorial-like style. The PDF can be downloaded here (from the source).
Web Apps, SPA, PWA with vanilla Java Script (ES 6+), CSS 3 and WebStandards only. As simple as possible, but not simpler. See you at: (Progressive) Web apps, Single Page Apps and WebStandards airhacks workshops at MUC airport, Winter Edition
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