What is the error in the Oracle ASM description?

ASM directly manages the hard disk, not the files, the files are evenly distributed across all the disks.

ASM instance SGA includes buffer pool share pool larger pool and so on.

ASM instances can be synchronized and data instances started and synchronized, and must be closed later than the database instance.

ASM is an oracle-based storage solution similar to RDMS, consisting of instances and files, maintained by the sql plus tool.