Installing Fedora 28
Installing Fedora from the live CD is fairly straight forward. You can comfortably follow the default prompts and default configurations, even when it comes to disk partitioning
However, I would reecommend a bit of customisation when it comes to partitioning. For example, creating also a /var partition makes it possible to reinstall without losing your /var partition. The same applies to your /home partition.
If you follow the default configuration, Fedora will delete all existing partitions and create a partitioning scheme with the following partitions:
If you already had a Fedora installation with a lvm and your /home files, you could customise the partitioning scheme by selecting your current /home as the "new /home". THis way, you preserve all your current /home files and configurations. The same applies to /var. Then you only need to create new /boot, /swap and /root partitions.
You could also rename your old /root to something like /old. This way you can recover conf files from your old "/root" to the new /root.