What comic book format should you use to make it easier to turn into a web comic? I am thinking 3x3 or 1x3 are the best format and most flexible; otherwise, turning them into webcomics might be extremely difficult? Am I correct into assuming this?
Any comic book format can easily be turned into a webcomic, because in the worst case you can simply post whole pages. This is common for comic formats that don't (solely) use rectangular panels, such as a manga.
If you have something more like the traditional newspaper comic, then you can post the comic online per strip, and print it with 3 or 4 strips per page. This is more common for webcomics that update daily or multiple times a week.
It's the other way around that is hard. If you have a webcomic that relies on the "infinite canvas", there is no good way to get it on a printed page.