I've heard a few new players complain that they find it hard to be useful to their village since their skills are so low. Here's a list of jobs that don't require skills. Feel free to add any others you can think of.
--Chicken/Rabbit/Livestock caretaker--
Sorting the animals and making sure they're fed is necessary for any big village and it takes no skill at all. Just cart some crops to the feeding throughs.
--Leatherworking--
It's common for villages to have huge stacks of skins that people are too lazy to dry and turn into leather. All you gotta do is put skins on drying racks and in leather tubs.
--Cheesemaking--
All you need to do is to put milk and rennet in a tub and check every day to make sure your cheese hasn't turned to generic gouda. Easy! Of course, it's better if someone skilled crafts the curding tub, cheese trays and rennet for you.
--Sericulture--
Silk is a pain to make, so even low quality silk is worth a lot! This is probably the most profitable thing a noob can do, since silk is always in demand.
--Baking--
Get someone with higher skills to make tons of pastry dough and sticks. Lighting the ovens and baking the dough could be very useful for others. I don't know about other cooks, but personally I always found baking tedious.
--Gathering Dragonflies--
Dragonflies aren't great curios, but they tend to get used up quickly anyways. All you need to gather a lot of them is a horse and a swamp.
--Pearl Gathering--
I'm not sure how the latest credo affected this, but pearls are great curios that are also worth a lot (at least, they were).
--Gathering Grey Clay--
Clayworkers always need grey clay to make potter's clay.
--Pepper Farming--
Pepper is always in demand. Ever garbage q peppers are valuable. Starting your own low q pepper farm is a good idea.
--Beehive Farming--
Every 13 days, beehives produce wax even if they aren't near any crops. They also produce honey often. Building a ton of beehives and leaving them in a cave is therefore useful since wax is always needed for wax seals and honey is always needed for honeybuns. Thanks to a recent update you might need to wear armor to harvest anything related to beehives, though.
--General Slave Labor--
Villagers often need help gathering large amounts of water from community fair, terraforming large areas or gathering materials for complex buildings like stone towers.
--Art--
Art can make a village beautiful, but designing nice images is hard work since this game's color palette is so limited. Still, if you're up for it, beautifying the village would no doubt make your fellow villagers happy. You might even be able to sell some artwork to others!
--Trading--
Selling things at the community fair can be a huge help to your village since having gold quills mean you can upgrade your equipment faster.
--Village Planning--
Planning where things like buildings should go can go a long way in making a village efficient and aesthetically pleasing. Not many people bother drawing village maps, but I think doing it is worthwhile.