This posting distinguishes among homophones. This tutorial guides you through the most common errors.
ALL RIGHT vs. ALRIGHT
All right: all right means okay, satisfactory, agreeable, safe, good, well.
Alright: While alright is used often in fictional dialogue, and is still preferred by some writers of journalistic and business publications, we'll merely say that it is outdated for daily use.
ITS vs. IT'S ...
This posting helps to avoid confusing spelling errors.