@SOL_rocks Aside from alternate versions and retrofits there is about maybe ~470. Most ships have their own unique skills (except most common ships, which have generic ones ie: Quick Reload or Full Firepower, etc) so most guides come in form of Team composition or Individual ship guides and reviews. There is also a progression guide in the wiki and so many others done by youtubers and other websites.
@SOL_rocks But there are also ships that have identical skills and stats (ie Graf Spee and Deutschland), and generic skills that get passed around with each others. So more than a few ships are only different by art and voice.