Noun
blocking and tackling (uncountable)
(idiomatic, US) Basic tasks or skills in an undertaking or occupation.
Some people try to find things in this game that don't exist but football is only two things - blocking and tackling. Vince Lombardi
Success doesn't necessarily come from breakthrough innovation but from flawless execution. A great strategy alone won't win a game or a battle; the win comes from basic blocking and tackling. Naveen Jain