Was Gallipoli Japan's main amphibious lesson?

Did Gallipoli's failure shape later Japanese amphibious warfare?

Yes, strongly, but Tsingtao and observation of Royal Navy activity in the Indian Ocean were also important.

Gallipoli mattered greatly, though it was not Japan's only model. Japanese experience at Tsingtao and observation of Royal Navy activity in the Indian Ocean also influenced its amphibious thinking. This broader evidence complicates accounts that trace Japanese doctrine to one famous Allied failure. Japan drew lessons from its own campaigns as well as the close study of another navy.