Reference Sheets & Cheat Sheets
Fast, clean, zero-clutter technical reference guides designed for developers, contractors, and health professionals.
Git & GitHub CLI Commands Cheat Sheet
Instant reference for staging, branching, rebasing, stashing, and conflict resolution across everyday software development workflows.
SQL Joins & Advanced Query Cheat Sheet
Visual reference and syntax for INNER, LEFT, RIGHT, and FULL OUTER joins, Venn diagrams, CTEs, and window aggregation functions.
CSS Flexbox & CSS Grid Visual Guide
Modern CSS layout reference covering flex-direction, align-items, justify-content, auto-fit grid columns, and place-items shorthands.
Contractor Quantity Estimating Formulas
Job site rules of thumb for concrete cubic yards, drywall 4x8 sheet counts, 16" OC stud framing, and roof pitch multipliers.
2026 Federal IRS Tax Brackets & Contribution Caps
Official 2026 federal marginal tax brackets, standard deductions ($14,600/$29,200), and 401(k), IRA, and HSA statutory limits.
Linux & Bash Shell Scripting Cheat Sheet
Essential CLI commands for server administration, file permissions (chmod/chown), log filtering (grep/awk/sed), and network debugging.
Regular Expressions (Regex) Cheat Sheet
Complete syntax reference for lookaheads, anchors, quantifiers, character classes, and common regex recipes (Email, URL, IPv4, Phone, UUID).
HTTP Status Codes Reference (100–599)
RFC-standard guide to every HTTP response code: 200 OK, 301 Permanent Redirect, 400 Bad Request, 404 Not Found, 500 Server Error, and 502 Bad Gateway.
Standard Concrete Mix Ratios & PSI Tables
Job site recipes for 2500, 3000, 4000, and 5000 PSI concrete mixes. Cement, sand, and gravel volumetric ratios for slabs, footings, and driveways.
US Military Body Fat Standards (AR 600-9)
Official US Army and Department of Defense maximum allowable body fat percentages by age group and sex, tape test circumference formulas, and standards.