During each Season in Sky there is a new Quest Giver Spirit in Home from which you can collect four quests each day.
Completing each one of these Daily Quests rewards you with one Seasonal Candle, for a total of four candles per day from all Daily Quests.

Return and speak to the Spirit in Home to collect your reward when each quest is complete.

Each day the Spirit moves to stand in front of a different portal. This portal is the land where you can complete the Daily Quests. It is also the area where you can find the Seasonal Candle bunches for that day.

There are four types of quests every day:
Social - Do something fun with a friend!
Seasonal - Tasks inspired by the theme of the season.
Ecology - Interact with the world and the creatures.
Spirit - Find or revisit one of the Spirits and experience their memories.

Tap the top left of the screen to show your quest list and progress at any time.

When there is no active Season, the normal Quest Giver will appear to offer Daily Quests. Completing these quests will let you claim regular candle rewards instead of Seasonal Candles.