If it is numbness when squatting, it may be caused by the weight of the barbell being too heavy on the nerves. As long as there is no pain in the spine and other related positions, there is basically no problem. I occasionally get numbness in my arms when I squat.
If it is the latter, it proves that your nervous system has been oppressed or damaged in some way. This problem may be caused by incorrect posture during fitness, or by incorrect sitting posture in your daily life. If this problem occurs, you must go to a regular hospital for examination in time before you can continue to exercise.
Finally, I suggest that you hire a qualified personal trainer in the early stage of fitness, which can not only achieve the purpose of fitness, but also correct incorrect posture and common sense of fitness and achieve real scientific exercise.