I downloaded odoo 13 (windows) from https://www.odoo.com/page/download then i opened the files on pycharm and made a new directory,named custom_addons under odoo folder but when i updated app list i searched the module but didnt find that then i pasted that module under by default addons folder i found my module. Why i was unable to get my custom module when i added that on my cystom_addons folder ?
In the .conf file you need to add the path of the custom addon folder.
For in detail reference, find any of the following links:
Link 1: https://www.getopenerp.com/install-odoo-12-on-ubuntu-18-04/
Link 2: https://www.cybrosys.com/blog/how-to-install-odoo-12-on-ubuntu-16-04