Unity 2018.4 is the LTS release, containing features released in 2018.1 to 2018.3. Unity intends to support this version for 2 years. For more information, see the Tech & LTS streams blog post and the LTS release page.
Follow the links below to find User Manual pages on new and updated features in Unity 2018:
These pages list the corresponding version’s new and updated User Manual pages, detailing the following:
If you are upgrading existing projects from an earlier version of Unity, read the Upgrade Guides for information about how your project may be affected.