PHP is a server side language. It support HTML because HTML is a client side Language. PHP courses provide the method of connectivity of database with HTML file for security & we can directly put the PHP codes in to html code.
In these PHP courses anyone can make dynamic sites and e-commerce websites. By the use of include method, file size can be reduced. Image gallerias can be made by very simple script. It is a most secure language and nobody can hack your data. For more information about PHP courses check out the website.