After 20+ years of coaching golfers of all levels, I can tell you this: you don't need fancy equipment to improve your game. I've seen more progress from students with alignment sticks and a smartphone than from those who bought the latest $500 driver.
What you feel in your swing and what's actually happening are often completely different. I see this daily. Your smartphone bridges this gap, showing you exactly what's happening, while alignment sticks provide the visual boundaries that groove proper movements. Together, they're golf improvement gold.
Simply find a space with about 8 feet of clearance, grab a couple of alignment sticks (under $20 at any golf store), and set up your phone on a stand or chair at hand height. Make sure you've got good lighting so you can analyze your movements clearly.