Amit's articles are an awesome gamedev resource that get reposted from time to time (with good reason). Bookmark is recommended, the canonical link is:
Example of other topics of interest there: Hex Grid implementations, Why piecewise circles are better than bezier curves in generating curved roads, and a 2D visibility algorithm.
http://www.redblobgames.com/
Example of other topics of interest there: Hex Grid implementations, Why piecewise circles are better than bezier curves in generating curved roads, and a 2D visibility algorithm.