21
5
2
Build in-demand cybersecurity skills with a free course on security management, risk, access control, cryptography and incident response—ideal for career starters.
5
(7)
2h55m
15 exercises
Build job-ready IT security skills with a free online course: risk management, Linux, networks, incident detection, and Python—plus tips for resumes and interviews.
4.82
(17)
15h04m
18 exercises
Boost your cyber security skills with a free online course on system and web protection, network defenses, and real-world attacks—study fast and earn a certificate.
4.81
(148)
29h44m
20 exercises
Free CourseFoundations of Cryptography: Symmetric, Public-Key, Hashing and Signatures
5
(1)
32h51m
57 exercises
Free CourseAdvanced Topics in Cryptography
5
(2)
22h34m
9 exercises
Free CourseCyber security
4.77
(374)
2h07m
24 exercises
Free CourseInformation security lessons
4.77
(47)
7h15m
11 exercises
Free CourseIntroduction to Cybersecurity
4.73
(15)
7h43m
6 exercises
Free CourseCyber Security Masterclass
4.64
(22)
1h36m
6 exercises
Free CourseCyber security full course
4.63
(8)
11h06m
Free CourseCompTIA Security course
4.4
(5)
26h11m
41 exercises
Free CourseCyber Security full course
4.22
(9)
11h03m
Free CourseCyber Security
4
(1)
11h30m
7 exercises
Free CourseCyber Security For Beginners
3.8
(5)
37h48m
6 exercises
Free CourseApplied Cryptography: AES, RSA, ECC, TLS, Tor and Bitcoin
New
13h20m
16 exercises
Free CourseModern Cryptography for Beginners: Encryption, Hashing, Signatures and Secure Computation
New
24h07m
25 exercises
Free CourseModern Applied Cryptography: AES, RSA, ECC, Hashing and Post-Quantum Basics
New
37h34m
23 exercises
Free CourseSQL Injection Masterclass - Web Security Academy Labs
New
9h42m
17 exercises
Free CourseCyber Security CISSP Exam
New
9h39m
12 exercises
Free CourseCryptography and Network Security
New
14h43m
28 exercises
Understanding Zero Trust Security: A Beginner’s Guide
Learn what Zero Trust security is, the core principles behind it, and why organizations are adopting this modern approach to cybersecurity.
Ransomware Explained: How It Works and How to Protect Yourself
Learn what ransomware is, how it infects devices, and the practical steps you can take to protect your data and stay safe.
How to Spot Phishing Emails: A Practical Guide
Learn the practical warning signs of phishing emails and how to protect your accounts from online scams.
Threat Modeling for Beginners: How to Think Like an Attacker to Build Safer Systems
Learn threat modeling step by step to identify risks, prioritize threats, and design safer systems with practical cyber security habits.
Security Operations Center (SOC) Fundamentals: How Blue Teams Detect, Triage, and Respond
Learn SOC fundamentals including detection, triage, investigation, and response to build practical cyber security defense skills.
Building a Practical Cyber Security Learning Path: From First Concepts to Hands-On Defense
Learn a practical cyber security learning path from fundamentals to hands-on defense, including hardening, monitoring, and incident response.
An Introduction to Node.js: Building Fast and Efficient Backends
Discover what Node.js is, its key features, and why it’s a top choice for building fast, scalable, and efficient backend applications.
A Beginner’s Guide to Progressive Web Apps: Bridging Native and Web Experiences
Learn how Progressive Web Apps (PWAs) blend web and native features to deliver fast, secure, and offline-capable user experiences across all devices.
Web Development
Programming Languages ( Python, Ruby, Java, C )
Office Productivity (Excel, Word and More)
Artificial Intelligence and Machine Learning
App Development
Databases
Software testing
Cloud Computing and Web Servers
Robotics and Drones
Data Science and Business Intelligence
Backend development
Programming Fundamentals
Developer and IT Tools
Hardware, Operating Systems and IT Support
Computer Basics
Game development
With the increasing importance of protecting digital information, understanding cyber security has never been more critical. We offer 18 free online courses designed to enhance your knowledge and skills in various aspects of cyber security. These courses are ideal for anyone looking to safeguard computer systems, networks, and digital assets from cyber threats.
Our courses cover a broad range of topics including Computer Systems Security, Cyber Security, Information Security Lessons, Cyber Security Full Course, IT Security, Cyber Security Masterclass, Network Penetration Testing Course, Information Security Management Fundamentals, Cryptography, and Network Security.
You will also find advanced topics such as Introduction to Cybersecurity, Advanced Topics in Cryptography, Cyber Security CISSP Exam preparation, and the CompTIA Security Course. Each course is designed to provide practical skills and knowledge that can be applied directly to protect digital information against unauthorized access and cyber threats.
Moreover, upon completion of these courses, you will receive a free certification to validate your newfound skills.
To start learning, you'll need to install the Cursa application on your mobile device. Android users can download the app from the Google Play or at App Store ( Apple ).
In all, there are more than 1000 courses, divided into more than 400 categories in 5 different languages, where we provide the digital certificate for free to everyone.
About
After completing the course you will have free access to the digital certificate of course completion.
How to get it for free: It is only possible to issue the certificate in our application, which can be downloaded from Google Play or App Store, so you can take the online course here and use the app only to issue the certificate. Being that you can also take the courses through the app if you wish.
In digital format: After completing the course and generating the certificate through the application, the image of the same will be generated in the photo gallery of your cell phone and will also be sent to your email.
Why the certificate is important: You can use it to improve your resume, to rise in careers or positions, to enrich your knowledge and among several other applications.
See more about the Certificate
Download the app! to have access to more than 4,000 Online Courses + Certificate, all free!
Download the app! 100% free courses.
Carry knowledge in your pocket.
Download the Cursa app.
There are hundreds of free courses available, with a free certificate of completion that is saved in your mobile image gallery.
Download the app to access the Course Completion Certificate for Free.
+ 10 million
students
Free and Valid
Certificate
60 thousand free
exercises
4.8/5 rating in
app stores
Free courses in
video and ebooks
Cryptography
Digital Forensics
SQL Injection
What are people saying about free online courses of Cyber Security
Masooma Batool
GCD(529,123): 529 mod 123 = 37 123 mod 37 = 12 37 mod 12 = 1 12 mod 1 = 0 → GCD = 1 (co-prime)
CourseCryptography and Network Security
Shohanur Rahaman
Thanks for classes We can do better.
CourseComputer systems security
kgosi
I gave myself a task tht at the end of the year I will know 50% of this cyber security thing because I’m coming from a divorce of 9 years marriage……….
CourseCyber security
Darlene
Thank you I have a daughter Name Candis Shereece Swinney
CourseCompTIA Security course
Josephine Serebour
I love this content as it gives me simple understanding to IT Basics.
CourseIT Security
Rashid
can I get a job with only this certificate?
CourseCyber security full course
Anele Mangala
the lessons was very good and understandable thank you
CourseCyber Security Masterclass
Masooma Batool
X ≡ 2 mod3, 2 mod5, 1 mod11. CRT: moduli 3,5,11 coprime. M=165. Compute: (2×55×1 2×33×2 1×15×3) mod165 = (110 132 45)=287 mod165 = 122. So X=122.
CourseCryptography and Network Security
Khetre Dk
Notice cource. if you know you know!!
CourseComputer systems security
Masooma Batool
1. Solve 11^{23} \mod 187 . First, express the exponent 23 in binary: 23 = 16 4 2 1 = 10111_2 . Now, compute powers of 11 modulo 187:
CourseCryptography and Network Security