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devdocs.io/
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Introduction to Queries in PostgreSQL (General SQL query examples)
An Introduction to Queries in PostgreSQL dev.to/digitalocean/-an-introduction-to-queries-in-postgresql-44la
Chrome devtools tricks
DevTools – My Favorite Tips and Tricks dev.to/atapas/devtools-my-favorite-tips-and-tricks-32c7
30 Seconds of CSS
A curated collection of useful CSS snippets you can understand in 30 seconds or less.
30-seconds.github.io/30-seconds-of-css/#truncate-text-multiline
30 seconds of code – great javascript code snippets resource
> The core goal of 30 seconds of code is to provide a quality resource for beginner and advanced JavaScript developers alike. We want to help improve the JavaScript ecosystem, by lowering the barrier of entry for newcomers and help seasoned veterans pick up new tricks and remember old ones. In order to achieve this, we have collected hundreds of snippets that can be of use in a wide range of situations.
30secondsofcode.org/about
curl – Manual
command line tool and library for transferring data with URLs
curl.haxx.se/docs/manual.html