After giving it a full though I made a list of things you should know if you are looking forward into becoming one web developer.

Ok here’s the list:

• Html: This is the basic structure most websites, you won’t get anywhere without starting here. Take your time, html is easy to learn and you should be be able to use it easily without much effort.
• Css: This is the magic behind html styling. You could make stunning websites without knowing a thing on it, but you won’t get far if you don’t learn to properly use it.
• Server Side Scripting of your choice: this is not a most, but to become a full web developer you will be required to be able to use one server side scripting language. You can use any of your choice like php, asp, coldfusion, ECT. This is used to power your web pages, manage forms, and do many other things.
• Client Side scripting of your choice JavaScript: there’s no real choice here, if you want to add some nice animations, movement, and all other things you can think of. If you eventually realize that you like it (many web developers don’t), the only choice you got is on the use of a framework, these can really simplify things when working on JavaScript, else if you prefer you could use JavaScript without the aid of a framework, which is was my method or preference until I decided to try a framework, but it’s your choice.

BONUS…
these are some bonus abilities that could become handy for any web developer:

• Database: Learn to use a database, I would recommend you a sql derivative like mysql, these databases usually are compatible with some server side programming languages and will be lots of help, of course this is not required, as you can use other systems to store data, like .ini files (which is a text file with a special syntax and a .ini at the end) and text files.
• XML: learn to use xml and you can do some awesome things, of course it’s not something important, but it can become handy when storing info and in the remote case (when you get to JavaScript you will definitely fall for this) you try to use Ajax.
• I will think of more.

Please feel free to ask any questions concerning any of these, I will gladly answer them.