Almost all distros can dual boot, so there’s little reason to highlight one as being the best for it. Dual booting is a bit messy and risky no matter what you do, so back up your data first and, if you’re new to Linux, look up instructions for dual booting Windows 11 and your chosen distro.

Only one I can think of that does anything special with dual boot, off the top of my head, is Q4OS, which offers a way to install it from within Windows using an app. (It also happens to be tailored towards people familiar with Windows XP or 7, so it should be a somewhat smooth transition for a first time Linux user.) I haven’t tried this myself, but I imagine it just expedites the usual steps of dual booting: shrink the Windows partition, then install into the resulting free space (or to an unused disk).

If that doesn’t sound appealing, just try any distro recommended as “beginner friendly”, like Linux Mint. Tutorials should be easy to find.