What kind of adaptation for getting food and protection from enemies do cephalopods have?

Cephalopods do not have a solid shell, but they have adapted to defend themselves in other ways.
One of these devices is incredibly fast movement in the aquatic environment.
Some animals have a protective coloration that helps them to remain unnoticed on the seabed, while others, in general, can change their color like a chameleon.
In addition, some cephalopods have an ink sac, thanks to the emptying of which into the water, they create a kind of smoke screen, using which they flee.
For food and as protection, cephalopods use tentacles with suction cups and a kind of beak that can easily break the shells of bivalve molluscs.