Cyber Security
Threats, defence and real breaches, explained step by step.
Free courses in Cyber Security, Cloud, DevOps, data and AI. Every concept: a plain explanation, a real example, then steps you can follow line by line.
Simple explanationNo jargon walls. Plain words first.
Live real exampleReal companies and real incidents.
Steps one under the otherFollow along, line by line.
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All free. Start at chapter 1, or jump straight to what you need.
Build, run and protect servers and apps in the cloud.
Threats, defence and real breaches, explained step by step.
EC2, S3, IAM and more, from your first login to real deployments.
Portal, resource groups, Linux VM, Blob storage and VNet — simple English with India examples.
Git, Docker, Kubernetes and Jenkins pipelines, hands-on.
Security built into every step of the software pipeline.
Turn data into reports, insights and smart AI tools.
Formulas, lookups, pivots and charts for everyday work.
Clean data, build models and ship dashboards people use.
Python, statistics and machine learning with real datasets.
Pipelines, SQL, Spark and Databricks basics — so dashboards get clean, trusted tables.
LLMs, prompt engineering, RAG and AI agents for real work.
Code faster with Copilot, Claude, ChatGPT, Gemini and free local AI, in any language and IDE.
Jump into dashboards, interview prep and revision cards — same free site.
KPI dashboards, interview questions and Ravi Sir cards for every major course.
KPI Hub for Excel and Power BI, plus Excel and Power BI company dashboard packs.
Interview questions across courses, plus Cyber, Excel, Data Science and DevOps packs.
Ravi Sir revision cards — flip through AWS, Excel, Power BI, DevOps, Cyber and Gen AI.

Trainer and entrepreneur in Pune. Students call me Ravi Sir. Gold medalist in MCA. I teach cloud, DevOps, data and cyber security with real examples from my own work.
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Certificates are for Cyber Security, AWS, DevOps, DevSecOps, Excel, Power BI and Data Science. Generative AI has no certificate yet.
Get certifiedReal cyber attacks from the news, explained simply: what happened, how to defend, and a checklist. In English, मराठी and हिंदी.
On about 3–4 Nov 2026 mSeven (maker of mSecure) warned current and former users after an unauthorized actor acquired an encrypted copy of a database of users who synced with mSecure Cloud. The company says it has no evidence the attacker opened the vault contents, but still urges changing the master password, rotating stored passwords, resetting 2FA and replacing passkeys.
· explained 6 NovOn the night of 4 Nov 2026 Chainalysis updated its 30 Oct incident notice: names, usernames, password hashes and live tokens for all users were exposed. That changes the earlier public claim that authentication credentials and session tokens were not accessed.
· explained 5 NovOn 4 Nov 2026 CERT-In warned banks, NBFCs, fintechs, payment aggregators and crypto exchanges that an AI-assisted group it calls CRAFTY FALCON is calling victims’ own payment and disbursement APIs to send money out, and that the attacks are still going on. Reports say it tampers with client apps to skip checks, tests with ₹1 payments, and strikes on holidays and nights.
Short guides that answer one question each, with the exact steps, commands or formulas. Pick a topic to see every guide in it.
671 guides in English, plus 60 Marathi and Hindi versions of some of them. Topic numbers count English guides only, so they add up to 347.
Phishing, ransomware, phone and laptop safety, SOC skills, cloud security and interview Q&A.
All Cyber Security guidesDAX formulas, Power Query, data models, visuals and sharing reports.
All Power BI guidesEC2, SSH, Nginx, domains, free SSL and VPC networking, with the exact commands.
All famous app architectures (Netflix, Instagram, Amazon and more)All AWS Cloud guidesLookups, IF, PivotTables, charts, what-if analysis and free practice workbooks.
All Excel guidesGit, Docker, GitHub Actions, Jenkins, Ansible and Terraform for beginners.
All DevOps guidesPython, Jupyter, pandas, exploratory analysis and your first charts.
All Data Science guidesChatGPT and Gemini photo prompts, resumes, AI tools for students and teachers, n8n agents, RAG and staying safe from AI scams.