Was Crocodile stronger at Marineford? Or was he holding back in Alabasta?

 During the Alabasta arc, Crocodile displayed a level of power that was initially considered overwhelming by the Straw Hat Pirates. He possessed the Logia-type Devil Fruit called the Suna Suna no Mi (Sand-Sand Fruit), which granted him the ability to control and transform into sand. He had a reputation as a Shichibukai and controlled the desert kingdom of Alabasta from the shadows. His strength was showcased through his battles with Luffy and others. At Marineford, Crocodile was present as part of the war that took place at Marine Headquarters. While he did participate in the battle, he didn't display the same level of dominance as some other powerful characters present. This has led fans to speculate that he might not have been as strong as initially portrayed in Alabasta. It's important to note that power scaling and character abilities can be subject to interpretation and development by the author. Oda often keeps details deliberately open-ended to keep the story intriguing.

Does learning Morse turn you into a little bit of a computer because it's binary code?

 No, learning Morse code does not turn you into a computer or give you computer-like abilities. Morse code is a system of representing letters and numbers as a series of dots and dashes, which can be transmitted using sound or light. It is a simple way of transmitting information, but it is not related to computer binary code, which is the language that computers use to store and process data. While both Morse code and binary code use a series of ones and zeros to represent information, they are used for different purposes and are not interchangeable.