We are pretty happy with the overall stability of Godot 3.0, that we released in late January. Still, we want to provide the best level of support to our users, so we are going to make regular maintenance releases for the 3.0 branch, to bring backward-compatible bug fixes and enhancements to all users. Our aim is that you should be able to just upgrade to 3.0.1 and continue developing your 3.0 projects without any change (apart from C# support, which is still in alpha and thus a moving target).
Check the detailed release notes to see what's new in Godot 3.0.1, and what bugs have been fixed.