hey all ,i need a best developer guide for create custom module or overwrite and predefine functions knowlege .
Since you posted this on the Magento 1.x forums, I guess that you are referring to a guide to create modules for Magento 1.
Here you can find the official extension developers guide for Magento 1 from Magento:
There are a lot of resources related to that topic, I suggest you to take a look at the official guide and then search specific content in Magento blogs.
If you really want to learn all the things there are off-course multiple ways.
One is to read the guides of magento and fool around for some time.
You could also take some online courses (ex. lydia and other company's offer great deals on that). There are also ALOT of tutorials for magento 1.x..
Just make sure you aren't fooling around in magento 1.x and are following a magento 2.x tutorial or whatsoever haha.