Bitrix component and module customisation

I am working with Bitrix24. I want to customise the component and module of Bitrix24. But I didn't have the standard documentation for this. Some one help me for the same,how we can work with local folder for customise component and module etc.

If you need to change logic of component you may do through this way:

1. create the local folder in your documet_root path
2. create components folder in the local folder
3. create bitrix folder in the components folder
4. copy component folder from /bitrix/components/bitrix to /local/components/bitrix
5. edit logic in the component.php file (or in class.php file if component using new bitrix core - D7) in the copied folder

If you need to change only the view, this is another way:

1. Instead of creating the /local/components/bitrix you have to create /local/templates/.default/ folder
2. Copy there only the .default template of a needed component
3. Edit template.php file

With the second way, you also may change (or rich it) some data in final $arResult array provided for the template.php, just create result_modifier.php file in the template directory.

You can find this and other information in the free course Bitrix Framework, pay attention to this link, it will be very helpful