1. Do not use spaces in file and directory (folder) names
2. Use short filenames (seven-nine characters) that have meaning
3. Use lower case, but camel casing is OK; be consistent.
4. Use alphanumeric characters only: letters and numbers
5. Avoid special characters, such as * ! # $ % ^ & = + ; ,
6. Use underscores or hyphens; be consistent.
7. Use either .html or .htm (pick one nd stick to it, do not mix); preferred (newer) .html
8. All filenames end in dot-three-letter, some dot-four-letter, extension.