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progress.md

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+# Week 1 Progress Map — Updated to Day 4
+
+## Student Profile
+
+* Experience: Fullstack Web Developer (JavaScript, PHP, SQL, HTML, CSS, Python)
+* Goals: System administration (Windows, Linux, macOS), hacking, algorithms, low-level programming
+* Languages: C, Powershell, C#, Bash, SQL, C++, Python
+* Current Focus: CompTIA A+ → CCNA → Security+
+
+---
+
+## Week 1 Overview
+
+* **Concept:** Variables, Conditionals, Loops, Functions, Scope
+* **Goal:** Build foundation in core programming concepts, algorithmic thinking, input validation, and cross-language syntax comparison
+
+### Day 1 — C
+
+* Read user input
+* Count characters in strings
+* Enforce max length
+* Validate first character via ASCII ranges
+* Username validation: letters only, max length, starting letter
+
+### Day 2 — Python
+
+* Conditional logic: Even/Odd number check
+* Count letters in a string
+* Username validation implemented in Python
+* Multiple username validation
+* Runtime analysis (`T(n)` and `T(m, n)`) and time complexity
+
+### Day 3 — SQL (PostgreSQL)
+
+* Filter rows based on string length
+* Select letters-only usernames using regex
+* `CASE WHEN` to classify usernames as Accepted/Refused
+* Aggregate valid usernames count
+* Runtime analysis in SQL (`T(n, m) = n x m`) and scaling discussion
+
+### Day 4 — PowerShell
+
+* Conditional logic: `if / elseif / else`
+* Loops: `foreach` over strings and arrays
+* Input validation: letters only, max 20 characters, starts with letter, no spaces or digits
+* Username validator script for single and multiple usernames
+* Algorithm analysis: runtime `T(n, m) = n x m`, doubling users doubles execution
+* Security perspective: safe and defensive scripting in PowerShell, Windows admin context
+
+---
+
+## Completed Exercises Summary
+
+* **Exercise 1:** Even/Odd number check (Python → PowerShell)
+* **Exercise 2:** Count letters in string
+* **Exercise 3:** Single username validation
+* **Exercise 4:** Multiple usernames validation
+* **Exercise 5:** Algorithm scaling explanation
+
+---
+
+## Next Objectives (Week 1 Day 5)
+
+* Learn **Bash scripting** for Linux sysadmin workflows
+* Apply conditionals, loops, and input validation in Linux environment
+* Translate Day 1–4 algorithms into Bash scripts
+* Emphasize security and defensive programming
+
+---
+
+## Recommendations
+
+* Review regex patterns across languages (C, Python, SQL, PowerShell)
+* Practice linear runtime analysis (`T(n, m)`) in each context
+* Keep all scripts secure, avoid unsafe input handling
+* Document differences in syntax and idioms between languages
+
+---
+
+## Notes
+
+* Student has strong programming background; focus can be on **systems, security, and algorithmic thinking**
+* Real-world project orientation encouraged (username validation → real-world user input handling, audits, or security scripts)
+* Progress map will continue tracking daily exercises, language-specific skills, and algorithmic awareness