Overleaf, use Latex online.
Learn Touch typing.
Mendeley, the reference/bibliography manager.
Mathcha: Online tool for creating high-quality vectorized images of mathematic equations, flowcharts, and diagrams.
Runkit: Open source platform to convert MathML (equations in scientific articles and webpages) code to Latex code (to use in your documentation and reference).
Plot Digitizer: A free online tool to extract data points from a scanned graph.
Plot simple data online.
Diffuse Merge Tool can easily merge, edit, and review changes to your code. It can edit/compare the 'n' number of code files at once.
Sioyek is my recommendation for a PDF viewer with a great set of functionality for reading research papers.
Clockify is a time tracker and timesheet app that lets you track work hours across projects.
Untools: Thinking tools and frameworks to help you solve problems, make decisions and understand systems.
Noun Project: Free (creative commons) icons and photos for presentations and resumes.
PDF2GO: Compress PDF to a target size.
Napkin turns your text into visuals, charts, and graphics.
Tools to display journal rankings, quartiles, and other metrics for academic journals in Google Scholar.
Dunning–Kruger effect: The more you know, the more you question!
Bloom's taxonomy: Education is a persistent sequential process. Small consistent steps are more important than inconsistent leaps.
Pareto Principle: 80% of the outputs come from 20% of the inputs, and vice versa for the other 20% of output.
Parkinson’s Law: Work expands so as to fill the time available for its completion.
Newton’s First Law: Everything remains in a state of constant velocity unless acted upon by an external unbalanced force.