What are the strengths and weaknesses of the phalanx formation of the Macedonian infantry?

What are the strengths and weaknesses of the phalanx formation of the Macedonian infantry? In what terrain could the phalanx not operate successfully?

If the battle was not fought on level and open ground, these long and deep lines could not move in order and with precision.
Thus, the phalanx was strong only out of the blue, where all its parts were tied together. There she could withstand the attack of the enemy and overturn him with the weight of her onslaught. However, this entire phalanx system suffered from major shortcomings. She revealed a complete lack of maneuverability and vulnerability of the flanks, she lacked flexibility.