Your and you’re sound similar but have completely different meanings. This article lists the differences and when to use them.
The difference between to, too, and two is not always clear. This article offers a full overview of the differences between to, too and two.
Its and it’s are pronounced in the same way, but they have a different meaning. This article offers a full overview of the difference between these words.
Some people use lay and lie in the wrong context. On this page, you have a full overview of the differences between these similar-sounding verbs.
The difference between than or then can be tricky for some people. Than is used in comparisons and then as a time reference.