There are indeed non-canon Batman comics. These can range from one-shot specials to alternate reality tales. They give creators the freedom to play with the Batman mythos in ways that don't fit within the regular canon framework.
Yes, Batman Detective Comics is generally considered canon within the Batman comic universe. It contributes to the overall continuity and lore of the character.
The determination of which Batman comics are canon can be a bit complex. Generally, those published under the main DC continuity and officially recognized by DC Comics are considered canon.
Well, there are a significant number of canon Batman comics. It's a constantly evolving collection. Different story arcs and series contribute to the count, but it's difficult to provide a precise figure due to the ongoing nature of comic production.
Yes, they are. The Batman Beyond comics are usually regarded as canon within the Batman Beyond universe.
The Batman comics considered canon usually include those directly written by key comic book authors and officially recognized by DC Comics. But it can vary depending on specific storylines and reboots.
It depends. Different Batman novels might have different statuses regarding canonicity. Some might be directly tied to the main continuity, while others could be standalone or in alternate universes.
Yes, Batman: The Knight comic is typically regarded as canon within the Batman comic universe.
The status of the Batman prequel novel as canon is unclear. It could be if it complies with the core lore and is sanctioned by the relevant authorities. But if it contradicts or strays too far from the established Batman narrative, it's likely not canon.
It depends. Some consider them canon, while others have their doubts. There's no clear-cut answer.
It depends on the specific comic series and the context. Some comics are explicitly stated as canon, while others might be alternate universes or non-canonical stories.