So If I learn Wordpress, Drupal and Majento, how much I can earn?

Oh Sorry for not being clear, I am a SEO, and making money through that way. But now I found more chances in Open Source Web Development. SO thats why I thought about going for a course that teaches all this.
Yes I need more instructions and its a new area for me to learn. I need to know more about its opportunities and how can I benefit from it being a freelancer.

Here is what I would do if I found a new skill that interested me.

I'd do some online searches first for some basic tutorials and see how far that would take me. Then determine if I was getting bored or if this was something that really interested me enough to want to pay to learn more.

There is nothing wrong with wanting to expand your capabilities - but also keep in mind that the highest pay goes to those who are most proficient in one or two things as opposed to the "Jacks of all trades" - from my personal observation.

I'm not sure I agree with learning PHP first. Wordpress can be a great stepping-stone, especially when you are able to take an existing theme or plugin and pull it apart - I've successfully trained two different employees very quickly this way (within a couple of months - from no knowledge of HTML/JS/CSS/PHP to competent with all 4).

Ask anyone who has been programming for a while and I'm sure they'll agree with me - it's a long process and you are still learning new things 10 years later - whether new functions, or simply a new methodology..
While I'm sure you'll be able to create a plugin, or simple script - don't expect to become an expert within a few months.

And as lukedidit said, if you're looking at a career - I wouldn't recommend PHP. Learn either Java or .NET (C#). There is huge demand for Java/.NET developers in the business/enterprise world, which means more $$ in the long run.

Mark, I didnt know which are the ways to earn through these open source platforms, but I got one thing is that, PHP is the mother of all of these... and if concentrating on that will help me to study all this without going for a class.

But I need to know if I learn the PHP, and all these platforms, what I can offer, or what are the ways that these things let me to earn money?

Could you or anyone make a list on the ways and post here...I would be so thankful for all those and can move in the righ direction.

The money is not in WordPress. Everyone develops (or at least says they do) for WordPress so you competition will be fierce and your rates will be driven down.

Drupal is good, but the market just isn't there as much as WordPress. If you do find work, (which is difficult) you will still run into problems with cost.

Magento is where it is at. They have a good marketplace, millions of sites run Magento, there is a certification program, the job demand is through the roof, and people will pay good money for a good Magento developer.

The catch with Magento, however, is that you will NOT be able to develop for Magento if you have little to no knowledge of PHP. Magento is one of the most complicated PHP applications on the net today. It requires years of practical PHP experience before even approaching Magento. It utilizes over 10 different design patterns, has a DOM based XML configuration layer, and it takes a lot just to get some of the basic concepts just to navigate the file structure.

If it sounds all doom and gloom, good. This is exactly the picture I am trying to paint here. I wish someone had painted a similar picture for me when I was starting out, things would've probably ended up a lot different.

Here is the silver lining: Build modules/plugins and sell them. Do not do freelance work for others. If you sell your modules/plugins, you will derive much more satisfaction out of it.

My advice, should you choose to take it, is this:

Learn PHP first
Create simple scripts that do simple things. Buy a book and go through it front to back.

Pickup a good framework
There are loads of PHP frameworks out there. I would personally recommend CodeIgniter (it's easy and well documented) and then move to Symfony or Zend Framework (they are the enterprise level frameworks).
With each of these frameworks, take a popular application and duplicate it. Not to resell or rip off, but to see just how much it takes into putting together an application. I would start with simple services and move up to Facebook like applications. Those will really test your might.

Learn each of the Applications
The applications themselves have their own quirks that are exclusive to that particular application and therefore only experience can really give you this knowledge.

1. Build 10 plugins for WordPres and give them away.
2. Contribute to the fixing or patching of 10 plugins already on the WordPress repository.
3. Build 10 Paid plugins for WordPress and sell them.
4. Build 10 Drupal plugins.
5. Contribute to the Drupal community in some way.
6. Build 10 Free Magento Modules and put them on Magento connect.
7. Build 10 Paid Magento Modules and put them on magento connect.

I hope this helps.

Sincerely,

Ryan Street
(PHP Developer for 8 years, WordPress Plugin Developer and Certified Magento Developer)

If you need a out source work why not you try a odesk and free lancer??