Check out some of the basics of the PHP scripting language, along with links to further resources here.
Updated to include information on string manipulation in PHP.
If you are looking to add some interactivity to your website, then check out the information here.
To speed up the development process of websites and web applications, a user interface framework can be used, which provides HTML and CSS templates, and more.
If you want to make your website stand out from the crowd, learning CSS will help.
Updated to include information about CSS Preprocessors.
If you want somewhere to store information in your web project then you need to select a database that meets your needs.
Updated to include information about MongoDB.