Cultural traits are somewhat similar to the Policies of a government: players can pass Traits which enable effects over their whole State such as unlocking the consumption or production of new resources.
Traits monopolize Civilization Points to be passed and cannot be easily revoked. A player can only revoke one Cultural Trait at the time, and it takes a long time to complete (2 days in persistent games).
Some customs or skills can only be unlocked by researching the relevant Idea.
Free Traders[]
Starting in the Research Overhaul Update, once level 3 of a particular 
Cultural Skill is obtained, you unlock the ability for sell that particular resource to Free Traders; who will indefinitely purchase the resource at "a very low price based on the world average 'minimum price'"[1], but unlike other players will indefinitely purchase it at that price.
Cultural Customs[]
Customs represent the cultural practice of your people to consume a specific type of resource. Customs enable the demand for this resource allowing it to be distributed, sold, and consumed by your population.
This will affect what your Porcos can consume, you are automatically given Cultural Customs for any crops that you consume during the tutorial.
To activate a Cultural Custom, you need to spend 1 Civilization Point.
Cultural Skills[]
Skills represent the cultural traditions of craftsmanship of your people and allow you to unlock the production of new resources and to specialize your people by further improving production efficiency or quality of specific resources.
This will affect your Porcos on what they can produce and craft, unlike Cultural Customs you can spend up to 5 Civilization Points for each resource.
Cultural Skills Level 1 is either 'No skill needed for production', which means it has a Civilization Point cost of 0; or it is 'Allows production of this resource', which means it requires a Civilization Point in it before you can use it.
Produce[]
Meat, Fish, Livestock[]
| Property | 1 | 2 | 3 | 4 | 5 |
|---|---|---|---|---|---|
| Production Efficiency | 0 | +20% | +40% | +60% | +80% |
| Natural Sources Productivity | 0 | +10% | +20% | +30% | +40% |
Crops[]
| Property | 1 | 2 | 3 | 4 | 5 |
|---|---|---|---|---|---|
| Production Efficiency | 0 | +20% | +40% | +60% | +80% |
| Natural Sources Productivity | 0 | +20% | +40% | +60% | +80% |
Ores[]
| Property | 1 | 2 | 3 | 4 | 5 |
|---|---|---|---|---|---|
| Production Efficiency | 0 | +20% | +40% | +60% | +80% |
| Natural Sources Productivity | 0 | +5% | +10% | +15% | +20% |
Other Resources[]
| Property | 1 | 2 | 3 | 4 | 5 |
|---|---|---|---|---|---|
| Production Efficiency | 0 | +20% | +40% | +60% | +80% |
| Required Materials | 0 | -10% | -20% | -30% | -40% |