This is a great little drill which helps improve how you line up your putter and your understanding of exactly where you’re starting the ball.
You don’t need expensive equipment, simply find a flat section of the putting green and mark a target point (or choose a hole) around 4-5ft away. Then, using tee pegs or two balls, create a gate 1-2ft in front of you which is just wider than a golf ball. Now simply practice rolling the ball through this gate. It’s an incredibly simple drill, but also a fantastic way to understand how to line up putts and where you’re actually starting the ball on the green.
Combine this with the technical drills you’re working on and you’ll be holing more putts in no time.