Fielding in the game of cricket is the activity of defenders in gathering the ball after it is struck by the batsman, to restrict the quantity of runs that the batsman scores as well as to get the batsman out by getting the ball in flight or by running the batsman out. There are various perceived fielding positions, and they can be ordered into the offside and leg side of the field. Fielding by and large includes keeping the ball from going to or over the edge of the field (which would consider a limit), and getting the ball to one or the other wicket as fast as possible.A defender or fieldsman might handle the ball with any piece of his body. In any case, if while the ball is in play he wilfully handle it in any case (for example by Utilising his cap), the ball turns out to be dead and five punishment runs are granted to the batting side, except if the ball recently struck a batsman not endeavouring to hit or keep away from the ball. The greater part of the guidelines covering defenders are in Law 28 of the Laws of cricket. 

Counterfeit fielding is the activity brought about by a defender when he makes developments of a portion of his body parts as though he were fielding just to confound batsmen into committing errors. It is currently a culpable offense under the ICC rules.

Where should Tall fielder be placed in cricket?

As far about the tall fielder according to the experts the must be placed near the Boundaries because of their height it would give advantage for preventing the boundaries. They can also be placed at the positions of slip, gully etc these are the most suitable position for the tall players