Upgrade best practieses to 2018

Hi  ,

I Appreaciate that Upgrade gnereally is a standard process however the 2018 version is different than the others prior. 

What are the key points to cover a 2015 upgrade to 2018. Should I focus on try to move code to Extensions or more to event  / Subscriber model ? Has someone a brief guide and experience ? 

tx,

gabliver

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