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Already recommended Clean ABAP is a must read. However, it's a style guide and is not what I'd consider "best practice" content. It is also still debated in the larger community.
ABAP Starter is a good starting point.
Situation is a bit better with Fiori/UI5 as SAP provides Fiori design principles and DSAG published their SAPUI5 best practices. DSAG content is always solid and reliable, highly recommended.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.