You gather skills from where ever or whomever interest you in the moment.

Savant

At level 3 you gain proficiency in 2 skills, 2 tools, a weapon, a musical instrument or gaming set, and a language.

Select a Feat

At level 3 you may choose a feat.

Gain Two Additional Feats

At level 9 you can choose two more feats.

Select Any Two Feats

At level 13 you gain any two feats of your choice, even if you have already taken them or you do not normally meet the prerequisites (such as race or attribute).

Renaissance

At level 17 you gain the ability to use your attunement slots to give yourself advantage on checks against a chosen skill.  Each attunement slot you use this way will grant you advantage for any one skill until your next short or long rest, even if you are not proficient in that skill.  You may activate one of these at any time you have a free attunement slot and use the skill immediately with advantage.