While it always depends on the particular position, the general values of the pieces based on pawn = 1 are rook is between 4.5 and 5, knight is between 3 and 3.15, bishop is between 3 and 3.25. So Knight + Bishop is more valuable than Rook plus Pawn on average. So I wouldn't worry about white taking on f7 at move 6.
My first game.
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Technically, it's not something I should worry. But I think most of us started chess by playing moves like a4 just to get the rook immediately into play 'cause rook moves are easier to understand than knight's and bishop's. I guess old habits die hard.
Flawed but nevertheless very satisfying. Comment and critise freely on my analysis and my moves.