t.me/Bioinformatics: A channel for bioinformaticians with various resources.
t.me/allomics: Collection of materials for genetics and biotechnology.
Dave Tang's website: Personal blog of Dave Tang - a well-known bioinformatician very resourceful for learning.
Hadrien Gourle's website: Tutorials for bioinformatics.
Happy Belly Bioinformatics: A blog by Mike Lee with lots of useful tutorials.
Umer Ijaz's page: Resources for bioinformatics.
Learn by Example: Collection of tutorials for bash scripting.
Bash-Oneliner: Collection of bash one-liners.
Efficient Python Tricks and Tips: Collection of tutorials for bash scripting.
The Linux Documentation Foundation: Guides from The Linux Foundation.