While the concern that cracking your knuckles can lead to long lasting effects such as arthritis is valid, there has been no known correlation between cracking your knuckles and arthritis.
"The relation of habitual knuckle cracking to osteoarthrosis with functional impairment of the hand has long been considered an old wives' tale without experimental support. The mechanical sequelae of knuckle cracking have been shown to produce the rapid release of energy in the form of sudden vibratory energy, much like the forces responsible for the destruction of hydraulic blades and ship propellers.
There was no increased preponderance of arthritis of the hand in either group; however, habitual knuckle crackers were more likely to have hand swelling and lower grip strength. Habitual knuckle cracking was associated with manual labour, biting of the nails, smoking, and drinking alcohol. It is concluded that habitual knuckle cracking results in functional hand impairment."
This quote taken from a study by the National Library of Medicine explains what the popping sound in knuckle is caused by, and how knuckle cracking does not cause arthritis, although it can increase chances in developing functional hand impairment.
"Repetitive and intentional joint cracking won't cause cartilage damage or arthritis, but it may lead to other serious issues like instability within the joint and a loss of grip strength or hand function."
This excerpt from CentraCare also explores the possibility of repeated knuckle cracking leading to lower and function.
In short, cracking your knuckles will not lead to arthritis, but can lead to a loss in hand function .
https://www.centracare.com/articles-stories/cracking-knuckles-cause-arthritis
https://pmc.ncbi.nlm.nih.gov/articles/PMC1004074/