SQL Prepared Statements: A Practical Tutorial
What prepared statements actually do, why they prevent SQL injection, how they affect performance, and how to use them correctly from any language.
·4 min read · #sql#prepared-statements#security
#security
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SQL Row-Level Security: A Practical Tutorial
Learn how PostgreSQL row-level security works, how to write effective policies, and how to enforce per-tenant isolation safely in multi-tenant applications.
·4 min read · #sql#postgres#security
Content Security Policy Explained
A practical tour of CSP: what each directive does, how nonces and hashes work, how to roll out a policy safely with report-only mode, and the mistakes that quietly weaken it.
·4 min read · #web#security#csp
Cookies vs localStorage vs sessionStorage
Compare the three main browser storage mechanisms by lifecycle, capacity, security, and use case so you pick the right tool for tokens, preferences, and state.
·4 min read · #web#storage#cookies
CORS Explained In Depth
Understand Cross-Origin Resource Sharing: simple vs preflight requests, credentials, and the headers that decide whether your browser will let your fetch succeed.
·4 min read · #web#cors#browser
SSH Keys and Secure Server Access
Generate strong SSH keys, configure your ~/.ssh/config, lock down sshd, and use agent forwarding and jump hosts to access servers safely without passwords.
·5 min read · #devops#ssh#security
Linux File Permissions Explained
Read every rwx string at a glance, change permissions with chmod (symbolic and numeric), change ownership with chown, and understand when to use sudo. With runnable examples.
·10 min read · #linux#beginners#permissions