Need help understanding MACD

I have a default numbers 9,12,26 for my MACD but only 2 lines. Why not 3 lines since there are 3 numbers? The green line is more volatile than darker line..default color.
How do I know which line is for which number? I think that green line is # 9 MACD because it is faster and keeps on moving above and below dark smother line. Correct? But what number is the smother line? Is it #26? If so what is # 12 suppose to indicate?

Also since MACD just follows the price, do I really need it since I already have 10, 20, and 50 MA? If I remove it would it change anything?

Thanks in advance for your help.

Visit This very intresting Link... MACD is in detail In it...

Thanks for the link Umairs. Very informative

umairs 2004

Thank you very much. I needed to find time to listen to the video before making any assessment.It was informative, but like most tutorials never really explain thing you don't understand , but go into details with things you already know. At least in my case.

So buy signal is when MACD Is below 0 according to the video.

Below is someone's else tutorial which to me sounds in revere. He said the buy signal is when MACD is above 0 line.

Sell when MACD is below 0 line.

Can you make a brief comment please?

Thanks



Long\Buy

ENTRY: First We wait for a long signal alert
...
MACD: This is important! When you get the signal MACD must be above 0
...

Short\Sell

ENTRY: First We wait for a short signal alert
...
MACD: This is important! When you get the signal MACD must be above 0
...

I guess this must be "under" instead of "above", when selling/shorting?

MACD is a very popular indicator.
Try to be independent and do no take commonly used parameters.
This is really helpful for trading and very simple to calculate.