LaTeX is document editing and typesetting system particularly prevalent in STEM fields and applicable to any complex manuscript production needs. LaTeX have been created by Professor Emeritus Donald Knuth . I have recently discovered a brilliant multimedia resource about LaTeX applicable both to the beginnersand LaTeX users who need either a quick refresher course or reference: Free & Interactive Online Introduction to LaTeX by Dr John Lees-Miller . This course starts from the very introduction to LaTeX to clear and concise instructions with plentiful examples about how to create complex structured documents with figures, tables and automatic bibliographies, including professional presentations with beamer and advanced drawings with TikZ . Despite decades worth of working in LaTeX which included editing of books and conference proceedings I find this resource invaluable. If you are just starting in some STEM field, definitely beef-up on LaTeX as it is long established standard in STEM publications. This resource is free and open source.
Dr John Lees-Miller presenting Interactive Online Introduction to LaTeX