Master Coding Skills &
System Design.

Learn all five CSS position values with practical examples — dropdowns, tooltips, sticky headers, and fixed buttons.

Learn CSS transitions for hover effects, @keyframes animations, and performance best practices — no JavaScript required.

Learn CSS color formats (hex, rgb, hsl), CSS custom properties, color schemes, and building a theme system.

Learn responsive web design — mobile-first approach, breakpoints, media queries, responsive typography, and fluid images.

Master CSS Grid — rows and columns, placing items, template areas, auto-fill, minmax, and responsive page layouts.

Learn indexes, EXPLAIN, when to add them, and why over-indexing slows writes.

Learn scalar subqueries, IN, NOT IN, EXISTS, correlated subqueries, and derived tables.

PHP performance — OpCache, fixing N+1 queries, APCu caching, and profiling with Xdebug.

Learn SQL injection, XSS, CSRF, and secure file uploads — the top PHP security threats and their defences.