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Learn Composting

Turn kitchen scraps and yard waste into dark, crumbly compost without smells or pests.

Free to start. Built from a single prompt. No credit card.

Composting is managed decomposition: you give microbes, fungi and small creatures the food, water and air they need, and they turn scraps into dark, crumbly humus for your garden. The core skill is balance. Nitrogen-rich greens such as food scraps and fresh clippings need to be mixed with carbon-rich browns like dry leaves and cardboard, kept about as damp as a wrung-out sponge and given oxygen. Learnr builds a personalized course of short lessons on materials, methods, troubleshooting and using finished compost, adapted to whether you have a yard, a balcony or just a kitchen.

How to learn Composting, step by step

Learn greens, browns and exclusions. Greens include fruit and vegetable scraps, coffee grounds and fresh grass. Browns include dry leaves, straw, shredded cardboard and paper. In typical home systems, leave out meat, dairy, oily food and pet waste, which attract pests and can carry pathogens.
Pick a method that suits your space. A simple bin or open pile works in a yard. A tumbler is tidy but holds less. In an apartment, a worm bin with red wigglers or a sealed bokashi bucket handles kitchen scraps indoors.
Layer and mix with more browns than greens. A common rule of thumb is roughly two or three parts browns to one part greens by volume. Chop materials smaller to speed things up, and keep a stockpile of dry leaves or cardboard to cover each new batch of scraps.
Manage moisture and air. Aim for a pile that feels like a wrung-out sponge. Add browns if it is soggy or smelly, water if it is dry and inactive. Turning or poking holes adds oxygen, which keeps decomposition fast and smells away.
Try a hot pile once you have the basics. A pile around a cubic yard, built at once with a good mix and turned regularly, can heat up enough to break down quickly and kill many weed seeds. A compost thermometer shows when to turn it. Short Learnr lessons on the microbiology make the temperature curve make sense.
Cure, sift and use the finished compost. Finished compost is dark, crumbly and smells like earth, with original materials mostly unrecognizable. Let it cure a few weeks, sift out chunks to return to the pile, and spread it as a top dressing or mix it into beds.

What you'll learn

Balance green and brown materials for active decomposition
Choose between hot piles, cold bins, worm bins and bokashi
Manage moisture and airflow to avoid smells
Troubleshoot slow, soggy or pest-prone compost
Tell when compost is finished and use it in the garden

What's inside your Composting course

A sample path Learnr builds for Composting. Your real course adapts to your goal and level.

1. How decomposition works
2. Greens, browns and what to leave out
3. Bins, piles and choosing a method
4. Hot composting and turning
5. Worm composting and bokashi
6. Troubleshooting and using finished compost

How long does it take to learn Composting?

Setting up takes an afternoon. A cold pile can take six months to a year to finish, while a well-managed hot pile may finish in a couple of months. Understanding how to balance and troubleshoot usually comes within your first full cycle.

What you need before you start

No experience required. You need a bin, a corner of a yard, or an indoor worm or bokashi setup, plus a steady supply of both kitchen scraps and dry browns.

Common mistakes to avoid

Adding only kitchen scraps, which makes a wet, smelly mess. Always cover fresh greens with plenty of dry browns.
Letting the pile dry out completely, which stalls decomposition. Check moisture after hot, dry spells and water as needed.
Putting meat, dairy or oily food into an open home pile, which attracts rodents. Keep those out or use a dedicated system.

How Learnr builds your course

Type your topic

Tell Learnr you want to learn Composting, or get as specific as you like.

Get a personalized course

Learnr instantly builds a full Composting course tailored to your goal and skill level.

Learn and level up

Move through bite-sized lessons and interactive practice, earning XP and keeping your streak.

Composting questions, answered

Why does my compost smell bad?

A rotten or ammonia smell usually means too many greens, too much water or too little air. Mix in dry browns, turn the pile and make sure it is not sitting in a puddle.

Can I compost in an apartment?

Yes. Worm bins work well indoors when kept at room temperature and not overfed, and bokashi buckets ferment scraps in a sealed container. Some cities also run curbside or drop-off composting programs.

Are compostable plastics okay in a home pile?

Many are designed for industrial composting facilities that run hotter than home piles, so they may not break down at home. Check the label and local guidance before adding them.