Link

CTF Learning Websites & Community

Fabulous Platforms for Practicing and Learning.

picoCTF

Beginner friendly.

CryptoHack

Cryptography Practice Website.

CTFTime

Worldwide CTF Information & WriteUps.

SCIST

Students' Community of Information in Southern Taiwan.

Hackme CTF

A wonderful CTF website for all categories.

Attack & Defense

Place for Practicing Real-World Senarios.

HacktheBox

Learning and Certification available.

Offsec

A long-established company for certification

Medical Knowledge

Top Evidence-based Journal Articles.

PubMed

National Library of Medicine.

UptoDate

Lots of medical evidences.

Cell Press

Cell Molecule Theory Collection.