Save and update entities

public void InsertOrUpdate(T entity)
{
     if (entity.Id == 0)
     {
         context.Set<T>().Add(entity);
     }
     else
     {
        var query = context.Set<T>().Find(entity.Id);
        context.Entry(query).CurrentValues.SetValues(Entity);
     }
     //context.Entry(entity).State = entity.Id == 0 ? 
     //                     EntityState.Added : EntityState.Modified;
     context.SaveChanges();
}

I have already researched the internet and found something more performative or Clean, if someone can help me with some library thank you right away.