The 80/20 of it: Every idea here asks for a small effort to get started, and that is your 20%. The 80% is the payoff you get back.

Every street has a few dogs whose owners work late or travel, and Rover connects you with them. Sitters set their own rates, and Rover keeps 20 percent of each booking (25 percent in California), so a $20 walk puts about $16 in your pocket. Tips are yours to keep.

The 80%: You are already out walking most days. Add a dog and that same half hour pays about $16. Five walks a week is about $80 for time you were spending anyway, and repeat clients book the same days each week, so once the first few reviews land the bookings come to you. Overnight boarding could run $35 to $100 a night before fees if you want to go bigger.

1. Build the profile. Add a clear photo of you, a line about your own pets, and set your walk rate a few dollars under nearby sitters to land the first bookings.

2. Start close to home. Offer walks and drop in visits within a short drive first, so a 30 minute walk stays a 30 minute job.

3. Ask for the review. After each booking, ask the owner for a quick review. Five reviews is when the requests start coming to you.

Total time: About 30 minutes per walk, on the days you choose.

Facebook Marketplace and curb alerts are full of solid wood dressers, side tables, and chairs listed for free or under $30 because the owner wants them gone this weekend. A clean, a coat of paint, and new knobs can turn that same piece into a $150 to $250 listing.

The 80%: Most of the value is in the finished look, not the work. A $20 dresser, about $30 of paint and knobs, and a few hours of sanding can sell for $150 to $250, about $130 profit for one weekend, most of it spent waiting for paint to dry. Do two a month and that is a car payment.

1. Hunt for solid wood. Search Marketplace for free and cheap dressers and skip anything with a peeling laminate finish. Solid wood takes paint well and sells higher.

2. Paint it one color. Clean, sand, prime, two coats of a neutral color, then new knobs. Keep it simple so it photographs well.

3. Stage the photo. Shoot it against a plain wall in daylight, add a plant on top, and list at a firm price with the measurements.

Total time: One weekend per piece, most of it drying time.

People near you are paying to store a car, an RV, or a pile of boxes, and they would rather pay a neighbor than a storage company. Neighbor says listing takes about 10 minutes, is free, and takes a 4.9 percent plus 30 cent processing fee out of each monthly payout.

The 80%: This is the closest thing to money for nothing on the list. Ten minutes to list, then the renter drops off the boxes or parks the car and the payout arrives every month. A half garage or driveway spot commonly lists for $100 to $250 a month depending on your area, which is $1,200 to $3,000 a year for space you were not using.

1. Measure and photograph. Clear one side of the garage, measure it, and take three bright photos. Note whether a car or only boxes will fit.

2. Set your rules. Pick access hours, say what can and cannot be stored, and price it by checking two or three nearby listings.

3. Approve and collect. Accept a renter whose items match your rules, hand over access, and check the payout each month.

Total time: About 10 minutes to list, then a few minutes a month.

Plenty of people would rather pay someone than spend Saturday fighting a box of shelves. On Taskrabbit you set your own hourly rate and keep 100 percent of it plus tips, because the client pays the platform fee on top.

The 80%: The client pays you for the time they did not want to spend, and the platform fee lands on their side, not yours. Set $40 an hour, take one three hour Saturday morning job, and that is about $120 before tips. Happy clients book you again for the next delivery, so the work builds up without any extra selling. Experienced assemblers in busy cities charge more.

1. Register and pick categories. Sign up, pass the background check, pay the small one time registration fee, and choose two or three categories you actually enjoy.

2. Pack a task bag. A drill, a set of hex keys, a rubber mallet, and a level cover most jobs. Keep it in the car.

3. Reply fast. Invites go to the Taskers who answer first. Accept or decline within minutes and keep your calendar current.

Total time: You pick the hours. Most jobs run 1 to 3 hours.

Companies pay to watch ordinary people use their website and say what confuses them. On UserTesting most recorded tests pay around $10 for 15 to 20 minutes, short ones pay about $4, and you get paid through PayPal.

The 80%: No skill needed beyond talking out loud, and the tests fit the gaps in your day. Two $10 tests a night after the kids are down comes to about $100 a week, as long as enough tests match your profile. Some weeks are quieter, but each test takes 15 to 20 minutes from the couch.

1. Record the practice test. Apply, find a quiet room, and talk through the sample test. This is your audition, so keep talking throughout.

2. Fill in every profile question. Tests are matched on things like your age, devices, and shopping habits. A complete profile means more tests show up.

3. Check the app at set times. Tests go quickly. Look in the morning and evening, and answer the short screener questions honestly.

Total time: 15 to 20 minutes per test, from the couch.