It is so easy to live in the ocean that you don't need technology. You also don't need hands (either for brachiation or picking things up) nor do you have feet to even evolve a hand from. Tentacles might be nice for some things though.

How is showing it the object at different angles and different lighting conditions not a training phase?

You want to see: A movie. One word. The first word is one syllable. You're moving up and down. Move your left arm to see "Jump", shake your left leg for "Hop".