Here's a (possibly opinionated! `:-)`

) list of books/resources that might be helpful:

- Check out the third part of our online \(\mathrm\LaTeX\) course
- The LaTeX wikibook covers quite a bit of advanced stuff, including lower-level topics like lengths, boxes, macros, creating packages, etc.
- Stefan Kottwitz's LaTeX Cookbook is nicely structured, with a lot of good examples.
- The classic LaTeX Companion is still a classic, in our opinion.
- Nicola Talbot's new book LaTeX for Administrative Work is a lot of funâ€”automating many tasks with LaTeX.
- No LaTeX book list is complete without The TeX Book and TeX by Topic, especially if you're interested in the actual working details of TeX and LaTeX
- Take a look at this TeX.SX question for more inspiration!

Also, hanging around on TeX.SX to browse and answer questions would also help gain quite a bit of experience. You can also follow Overleaf's twitter feed about our Gallery updates for interesting examples.

- Creating a document in Overleaf
- Uploading a project
- Copying a project
- Creating a project from a template
- Including images in Overleaf
- Exporting your work from Overleaf
- Working offline in Overleaf
- Using Track Changes in Overleaf
- Using bibliographies in Overleaf
- Sharing your work with others
- Debugging Compilation timeout errors
- How-to guides

- Creating your first LaTeX document
- Choosing a LaTeX Compiler
- Paragraphs and new lines
- Bold, italics and underlining
- Lists
- Errors

- Mathematical expressions
- Subscripts and superscripts
- Brackets and Parentheses
- Fractions and Binomials
- Aligning Equations
- Operators
- Spacing in math mode
- Integrals, sums and limits
- Display style in math mode
- List of Greek letters and math symbols
- Mathematical fonts

- Inserting Images
- Tables
- Positioning Images and Tables
- Lists of Tables and Figures
- Drawing Diagrams Directly in LaTeX
- TikZ package

- Bibliography management in LaTeX
- Bibliography management with biblatex
- Biblatex bibliography styles
- Biblatex citation styles
- Bibliography management with natbib
- Natbib bibliography styles
- Natbib citation styles
- Bibliography management with bibtex
- Bibtex bibliography styles

- International language support
- Quotations and quotation marks
- Arabic
- Chinese
- French
- German
- Greek
- Italian
- Japanese
- Korean
- Portuguese
- Russian
- Spanish

- Sections and chapters
- Table of contents
- Cross referencing sections and equations
- Indices
- Glossaries
- Nomenclatures
- Management in a large project
- Multi-file LaTeX projects
- Hyperlinks

- Lengths in LaTeX
- Headers and footers
- Page numbering
- Paragraph formatting
- Line breaks and blank spaces
- Text alignment
- Page size and margins
- Single sided and double sided documents
- Multiple columns
- Counters
- Code listing
- Code Highlighting with minted
- Using colours in LaTeX
- Footnotes
- Margin notes

- Theorems and proofs
- Chemistry formulae
- Feynman diagrams
- Molecular orbital diagrams
- Chess notation
- Knitting patterns
- CircuiTikz package
- Pgfplots package
- Typing exams in LaTeX
- Knitr
- Attribute Value Matrices