Let us talk about skills. Skills is another important factor in the game and you cannot get any better cards if you do not raise your skills level.
All new players can get 5 out of 9 skills only. There is a limiter which stops you from buying more skills after getting 5 skills so you should choose wisely. To buy more skill slot you should have at least 300 PP and make a ticket to BRO asking them to buy "Letter to Santa".
There are 2 type of Skills in the game. The basic (1st and 2nd tier) skills and the advance (3rd tier) skills.
Basic SkillsThere is only 6 skills available to choose at start and each skill has it own advantages and disadvantage :

Melee – Allows you to use close combat weapons, such as swords, hammers and katanas.
Advantage : Short Timer
Disadvantage : Low Damage / Unable to attack moving target

Range – Allows the use of long distance weapons, such as pistols, crossbows and shurikens.
Advantage : High Damage / Attack Moving Target
Disadvantage : Long Timer / Status Change to "Melee" if attack players in "Melee" status

Personality – Lets you use special cards called “Techniques”, sort of magic like powers to slow down, weaken or paralyze opponents, or to hasten and protect your allies.
Benefits :
1- Delay players timer to give more time for you to attack them
2- Allow you to change your status with "Acrobatic" cards
3- Reduce target stats with weakening and grounding

Psynet – Allows you to improve you communication skills with other players, and to claim and conquest lands.
Benefits :
1- Able to claim lands (only though with "Neutral" and "Claim" status on land)
2- Scan target's HP and Stats
3- Able to use emotes in chat

Equipment – Buy this skill if you plan to rely heavily on defense. This skills allows you to use shields, helmets and other protections.
Benefits :
1- Increase your defense and offense with helmets, shields and armors
2- Avoid delay with "Apprentice Freedom" and "Freedom" cards

Crafting – Buy this skill to be able to craft wondrous items and weapons.
Benefits :
1- Able to make cards using blueprint and crystals
2- Saves Energy from buying cards from cards shop
Advance SkillsAdvance Skills are great to have and yet a little bit difficult to get. Those with 5 skills only, you will have to make a hard decision if you want to get "Advance Skills" or not as it might force you to choose a career as a Warrior/Leader/Engineer.
Advance Combat Skill (Tactic)
To get this skill you'll need to buy these 2 skills :

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Tactic - Tactic is Combat Skill "Advance Skill" and it can allow you to use a secondary attack and powerful cards.
Advantage : Grants a 2nd attack / Allows you to use powerful "Zeus Cannon" / Allows you to use "Quicksilver Dagger and Spear" / Both advantage of Melee and Range
Disadvantage : Timer for Tactic is longer then Primary / Both disadvantage of Melee and Range
Advance Social Skill (Leadership)
To get this skill you'll need to buy these 2 skills :

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Leadership - Leadership is Social Skill "Advance Skill" and you can create your own faction with many features and benefits that non-faction players can get.
Benefits :
1- Create your own faction
2- Can invite players to aid your faction and help it grow
3- Can use buildings which gives various bonuses (Engineer is required)
4- Can Ally with any alliance to join the war against opposing alliance
Advance Trade Skill (Engineer)
To get this skill you'll need to buy these 2 skills :

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Engineer - Engineer is Trade Skill "Advance Skill" and you can help your faction add new building to an empty land, though you need to consult with the faction leader first before deploying buildings.
Benefits :
1- Can deploy buildings
2- Can repair damaged building