Perhaps the most standard but effective exercise is the straight barbell curl. Most trainees are slightly stronger when lifting a barbell versus a set of dumbbells, so this is a great one for maximum strength development.
When doing the exercise the primary thing to focus on is that you’re not cutting the movement pattern short at all and that you’re not allowing momentum to cause you to lean backwards as you hoist the weight upwards.
This is one of the most common mistakes with this exercise – momentum performs more of the work than your muscles actually do. If you perform it in a slow and controlled manner, that should reduce the chances of this happening significantly and allow you to place a higher intensity deep within the muscle fibers.