If LINQ and the Entity Framework Core API are not sufficient in terms of functionality or performance, you can send any SQL commands directly to the database, including invoking stored procedures and using table-value functions (TVFs).
LINQ and the Entity Framework Core API (Add(), Remove(), SaveChanges(), and so on) are abstractions of SQL. Entity Framework Core (or the respective database provider) converts LINQ and API calls to SQL. The abstraction that Entity Framework Core offers ...