To level up in the first place you need to advance in your major skills (dependent on your class) in my current game I'm playing as a mage but instead of mysticism i have light armor as a major skill. How you level up quickly really depends on your class but if you just want to gain levels find something you can do over and over again that eventually increases a major skill and do it until you have leveled up major skills 10 times. - - - I have found with my mage character that standing outside of Cloud Ruler temple (location doesn't really matter), summoning Dremora, or Flame Atronachs and then killing them with destruction magic quickly increases my level. To level up my minor skills I do much of the same killing the summoned creature with my hands or with a blade, or blunt weapon making sure to block. - - - To level up Acrobatics and athletics jump around, swim, and run a lot, these take the longest to level up. To level up speechcraft go to any city and max out your disposition with all the NPCs you see. I know I've left out a lot of skills but you can probably find something to level them up. Good luck.
you use them
just fight and fight to fast level up
level up and enimies will have them eventualy
you level up and then upgrade your magic skills
There is no sure way to level up quicker in Happy Pets. But what I do to level up fast is, I clean the litter boxes in all my rooms, my friends rooms, and feed my friends' pets along with my own. Also if you play with the laster pointer you can level up fast too.
you use the puzzle palace daily challenge
Upgrade your intelligence when going up a level.
there is no way, all you have to do is the slow boring way. sorry
If you mean your Characters speed, then you have to upgrade your Athletics skill.
Same way you level up fast anywhere: use your major skills. You realize, however, that fast levelling leaves you with a weak, high-level character, because you cannot boost your attributes enough if you are only raising major skills.
keep battling Pokemon and people
A quick way is to help your nieghbours on their farms and you get more xp