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Note before start developing module in magento

-Enable dev mode:

• Enable the developer mode: bin/magento deploy:mode:set developer

• Rename file : pub/errors/local.xml.sample to local.xml

-Magento has cache, so if you doesn't see the code change on the screen, you can run:

bin/magento cache:clean

to clean the cache

-Some time when code, you need to clear some directory: https://devdocs.magento.com/guides/v2.4/howdoi/php/php_clear-dirs.html

in most case, it is “generated” folder

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https://devdocs.magento.com/guides/v2.4/architecture/extensibility.html

https://devdocs.magento.com/guides/v2.4/architecture/archi_perspectives/components/modules/mod_intro.html

Module is a structural element of Magento 2 – the whole system is built upon modules. Typically, the first step in creating a customization is building a module.

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