This release fixes a series of issues reported by the community over the last few months: you can find the full changelog here.
While in this patch release there's already a commit towards focusing compatibility with Xcode 12, if you are having troubles please refer to this issue #29984 and the workaround described there.
You can participate in the conversation for the next patch release in the dedicated issue.
To help you upgrade to this version, you can use the new upgrade helper ⚛️
You can find the whole changelog history over at react-native-releases.