There is not 'one size fits all', this is true also in the Project Management approach. Make sure you are using the right approach to solve the specific Business Need.
Nothing is for free
Understand your objectives and your priorities to make sure you spend your resources in the right way
Experience remains key! Theory alone does not solve a problem. You need sound understanding and knowledge of established Best Practices.
Success is all about People
Do you have the right skissl? Do your people have the right mindset? Are expectations aligned?
Start a Projerct only you have the answer to the above questions.