Here are the commands that I personally use from time to time and I always use google to find it before having this documentation:
Commands below are copied from this link: .NET Core Cli
I already have the tool in my machine, I only need to upgrade it with this command
dotnet tool install --global dotnet-ef
dotnet tool update --global dotnet-ef
For creating new table, updating existing table etc
dotnet ef migrations add [Migration Name]
After creating migration, database can be updated with this command
dotnet ef database update