Advertising banner sizes

250 x 250 – Square
200 x 200 – Small Square
468 x 60 – Banner
728 x 90 – Leaderboard
300 x 250 – Inline Rectangle
336 x 280 – Large Rectangle
120 x 600 – Skyscraper
160 x 600 – Wide Skyscraper
300 x 600 – Half-Page Ad
970 x 90 – Large Leaderboard

Adding custom post types (CPT) without a plugin

Creating a template object