Hello Everyone, I am new to AEM and looking for industry best practices to be followed in AEM styling for custom components.
Hi @sagrawal ,
From AEM core components perspective, we follow BEM like convention for css and use style system based presentation layer modelling. Please refer to  and  for best practices.
 - https://docs.adobe.com/content/help/en/experience-manager-learn/sites/developing/style-system-techni...
 - https://docs.adobe.com/content/help/en/experience-manager-learn/sites/developing/style-organization-...