In Hattrick, skill levels are shown as the terms ranging from disastrous to divine. In many situations it is convenient to use numerical skill values instead of terms, and these numbers can be found here.
Skill levels on Hattrick are alway rounded down. If you are interested in exact skill levels, check the subskills page.
Players may need different Skills depending on their position. There are primary, secondary and some are even talking of tertiary skills.
The Hattrick community often uses a-skill, b-skill and c-skill instead of primary, seconday and tertiary.
Stamina is absolutely vital for any players who use playmaking. If a player does not have enough stamina, a serious drop in their playmaking contribution will be noticed, particularly during the second half of matches.
Together with stamina, Playmaking is the most important skill for inner midfielders and wingers played towards the middle. It is also used by wingers, defensive forwards and offensive central defenders. Offensive wingbacks use a tiny bit as well. As noted above, this skill is used in conjunction with stamina.
It can be trained by playmaking training.
Wing skill refers to the ability to create scoring opportunities by advancing down the sides. This is obviously most useful for wingers (a-skill), although Wingbacks also are able to profit from it. A forward toward wing will also benefit a lot from this skill.
The ball is supposed to go into the net, and scoring ability makes sure it gets there. It is the most important ability for forwards, but not particularly important for anyone else. Any player with good scoring skill combined with good set pieces skill can score on a long shot special event.
The most efficient training type to improve scoring is scoring training.
Goalkeeping is the ability that goalkeepers use (and they need it a lot!) However, as it is the only skill they need, they rarely have any ability in other areas. The only other way to increase the performance of a goalkeeper other than goalkeeping training is to have him gain experience.
The scorer gets the credit, but the player giving him the decisive pass is just as important. Both forwards and midfielders, including wingers, profit from being good at this. Passing is also very important for use with tactics. It helps to compute ratings for Counter Attack, Attack on Wings and Attack in the Middle.
Defending skill controls a player's ability to stop opponent's attacks. Unconditionally the most important ability for all types of defenders. Midfielders may also put this ability to good use. It is also relevant on all players when using the Pressing tactic.
The most efficient training type to increase the defending skill is Defending training
One player is appointed for Set Pieces. He'll take all free kicks, corners, penalties, and in case of a penalty shoot-out, he'll take the first penalty. In all cases, lots of skill is needed in this area.
This skill can be trained through Set pieces training.