Progopedia is an online encyclopedia of programming languages. You can use it to look up syntax charts, coding examples, and other information about specific programming languages.
Computers in Beatley Library and the GSLIS Tech Lab have Adobe Dreamweaver, a text editor with many features to help with coding. Dreamweaver is not free, but there are many text editors designed to help with coding that you can download and use at home.
Use these resources to check your coding for errors.
Many websites offer coding tutorials and instructions; these are especially helpful when they provide coding examples you can modify, to see what your changes do.