Overtraining is a common mistake beginners make in the gym not just with strength training but with cardio as well. Lift hard with focus and have a plan. Don’t lift with the same muscles two days in a row. Don’t work biceps (curls) the day after working your back since they are secondary movers for back routines. However it’s ok to work back and bi’s on the same day.
Have a great day and stay active!