I have seen a few people ask how this works, so I will try to explain as best I can.
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Skill progress is how skilled you are in the use of the item, or how close your skills are to being proficient in it's use. Skill increase bonus is if the item helps boost in skill gain. If it has a yes it gives a small boost, not yet means you are not skilled enough to get the bonus, never means it will not have bonus at all, and I think there is another for after you surpass the skill levels for it where it no longer gives a bonus. Of course the condition is how much repair the items has or needs. Durability tells you an average you can expect the item to decay during use. Attacks/min is an average of how fast the item can be used (weapons of course), I prefer to look at the damage interval for this. Damage impact/electric/etc. tells you what type and how much damage is possible from the weapon. Note that it will not always do this damage, some times will be higher others lower, this is just an average. It also depends on the defence of what you are fighting. Range is how far you can reach with the item, notice the power fist has much shorter than an axe, and guns varry widely. The hit ability and critical ability are your basic chances of missing or hitting with that weapon.