Hello

I am new to TES and I need your help because I really can't fully understand the leveling system in this game.
I know that there will be 18 skills with 280 perks and so on, but what I don't understand is if there is a limit to leveling up.
In an interview Todd Howard himself says that they haven't set a level cap; but what that means:

1) you can develop everything and once you have maxed all the skills in the game you have reached a sort of "level cap".
2) your "level cap" depends on the "class " you play and because every class has a different number of skills and you reach the level cap once you have maxed all your class skills.
3) you must carefully decide what skill to develop because not everything can be fully maxed; therefore level cap depend on your choices and the limitation the developers gives you.

Sorry if is a bit schematic but I really don't know how this works so if I have completely missed it please tell me.
Try not to be hard on me for such silly topic; I'm totally new and I only would like to fully understand how things works in TES world.
Thank you everybody.

Whenever you earn experience for a skill (eg, using a healing spell to increase Restoration) it will also give you experience towards levelling up.

There will be a hard level cap in the game that may vary from character to character. When all of your skills are at 100 you have reached the hard level cap.

No classes
You level up by increasing your skills. The higher a skill is the more it contributes to levelling up
When you level up you get an increase to health, a perk and a choice of increasing stamina, magika or health
Theres a hard cap on level when you reach 100 in all your skills which will probably be around 70th level, but a soft cap of 50th level after which levelling gets slower

It's pretty much "A" the cap is only reached once all 18 skills have capped at 100. Also, "B" isn't even possible, as there are no classes that you a restrained to in Skyrim(as there were in Oblivion and Morrowind).

All skills are freely available to everyone, your only 'class' is your highest skills. If you have been using sword and shield,then when these skills increase, they count more toward when you next level up than the lower skills you haven't been using.

If your warrior decides fighting is boring, and starts using spells all the time, you will level up more slowly, until such time as your spell skills are higher than your sword and shield, when the game recognises behind the scenes that your 'class' has changed, then using spells will level you up quicker than using your sword.

The level cap is when all skills are at 100, but once you have maxed out your favourite skills, the other skills wil always be lower, so increasing skills and levelling will slow down across the board, should take a very long time to reach maximum level.