Including unilateral work in your training routine is one of the most important things you can do. Unilateral exercises like the bulgarian split squat will help build resilient joints, increase strength development, and minimize muscular and performance discrepancies between two sides.
Make sure to properly execute any single leg movement by actively engaging the core and lower body musculature. While performing this movement it is imperative that you have good knee and hip alignment, making sure the knee tracks directly over the toes. Failing to do so will result in improper form and possible injury.
Unilateral work will help bring up any weak links and make you stronger on your other compound lifts. You can also vary single leg work by alternating sides after each rep, but I prefer the non-alternating variation because of constant tension that results higher levels of metabolic stress.
Add these in after your main lower body compound lift for the day. Reps in the 12+ range will not only test you physically, but mentally as well. Control the movement the entire time and keep perfect form for optimal results.