Oracle RAC 18c Patching - datapatch After patching GI Home and DB Home simultaneously using command:
.oraenv
+ASM1
opatchauto apply /patchlocation

Should i run ./datapatch from DB home or GI home? Or it doesn't matter from which home? Thanks
For the Grid Infrastructure Management Repository (GIMR) a.k.a. MGMTDB (if you have it), datapatch is automatically executed as part of patching.
For regular databases, execute datapatch from the database home.