Beginner in WordPress-Which "customizable" plugins must I have?

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[img]chrome-extension://gafjimepaiecpbmbmgaefokbekhoecaj/images/right-arrow.png[/img] Hello, I am a beginner and I am trying to find the plugins+One theme with the MOST FLEXIBILITY, and INTERACTIVE interface (where u can drag and drop, move, even draw, if it exists)

Thank you so much

Gustav

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[img]chrome-extension://gafjimepaiecpbmbmgaefokbekhoecaj/images/right-arrow.png[/img]
BTW I have heard about Avada-Is it the ABSOLUTE best, most customizable theme? Are there others?