Sims 3 Skill & Hiden Skill

For Athletic:
Jog
Work out on Equipments

For Charisma:
Charming Sims
Reading books on Charisma

For Cooking:
Cook a meal for the house hold
Cook for your self
Reading books on Cooking

For Fishing:
Fish anywhere for any Fish
Reading books on Fishing

For Gardening:
Plant new Seeds
Tend to your Garden
Reading books on Gardening

For Guitar (music):
Practice Guitar
Preform song's
Preform at Party

For Handiness:
Tinker with Items
Fix Broken Items
Upgrade Items
Reading books on Handiness

For Logic:
Play chess
Reading books on Logic

For Painting:
Create a Painting or Portraits.

For Writing:
Practice writing
Write a book

Child Cooking:
Just order the child to Cook on the Children stove

Blocks:
Just order the child to play with the blocks once you have bought the block table

Potty_Training:
Just Click on the toilet for Toddlers to train them

Learn_To_Talk:
Just select an adult and click on the Toddler to teach it to talk

Learn_To_Walk:
Just select an adult click on the Toddler to teach it to walk

Xylophone:
Order the child to play with a Xylophone

Peg_Box:
Just tell the child to play with the Peg Box


----------------
Hidden Skills
Also there are some hidden skills that have been enabled for you:

Collecting:
You have to find and collect bugs and gems.

Chess:
Play chess on the chess table
*does not work if you play chess on the computer

Dancing (only goes up to level 3):
Just dance when music is on
*does not work if you dance with someone

Diving(only goes up to level 5):
I was not able to test this one as I could not find a diving board but if anyone makes a diving board, this skill has been enabled

Hacking:
If you have the trait that allows you to hack just hack from a pc

Homework:
Just do some Homework if your a teen or younger

Mooch:
If you have the trait that allows you to mooch, just mooch off of your neighbors

VideoGame:
Just play a council game
*does not work with computer games
*does not work with VR goggles

AirGuitar:
This one I am not to sure, I was not able figure this one out but my guess is your Sims will randomly play air guitar and that's how your skills will go up

Foosball:
Buy a Foosball machine and play

skill	Logic	Painting	Writing
1			Can write Fiction/Non-Fiction
2			Can write Trashy novel
3	Can search galaxy with telescope		Can write Drama/Childrens book*
4
5	Can tutor children and teens Can talk about celestial objects	Get 'Practice' interaction Can paint Still-Life	Can write Humor
6		Can paint a 'Brilliant' painting	Can write Historical
7		Can paint Portrait
8		Can paint Memorized scene	Can write Mystery
9		Can create a 'Masterpiece'
10	Can tutor adults and elders		Can write Romance

skill	Logic	Painting	Writing
1			Can write Fiction/Non-Fiction
2			Can write Trashy novel
3	Can search galaxy with telescope		Can write Drama/Childrens book*
4
5	Can tutor children and teens Can talk about celestial objects	Get 'Practice' interaction Can paint Still-Life	Can write Humor
6		Can paint a 'Brilliant' painting	Can write Historical
7		Can paint Portrait
8		Can paint Memorized scene	Can write Mystery
9		Can create a 'Masterpiece'
10	Can tutor adults and elders		Can write Romance