Resources/tips for conducting a great due diligence?

Hi all -
I will soon be entering the due-diligence phase for a home restoration business (asset sale). This will be my first DD, wanted to ask this community for tips/guidance on how to do it well. Any resources - playbooks, DD checklists, videos etc to recommend? People who have done a DD - what are your biggest learnings? What would you do differently if you were to do your first DD over again? Thank you!