1] Mini Earnings
Requirements: No skill, but a lot of boring work
Risk Level: Medium
Profit Level: Low
Reliability: Very High
Common Risks: Getting viruses and malware by surfing many sites
a) PTC websites: Click ads and get paid in bitcoin
b) Bitcoin Faucets: Enter captcha and get paid in bitcoin
c) Ad watchers: Watch ads or videos and get paid in bitcoin
d) Minijobs: Complete mini tasks and get paid in bitcoin
2] Writing
Requirements: English language, possibly other languages
Risk Level: Low
Profit Level: Medium
Reliability: Very High
Common Risks: Getting banned from the forum by posting 1 liner post spam or not getting paid , Copyright problems
a) Signature campaign: You put an ad code in your signature, and get paid in bitcoin. LIST OF CAMPAIGNS: https://bitcointalk.org/index.php?topic=615953.0
b) Translator: Offer your translation service to people who want things translated from english to other languages
c) Article writer: There are many news websites that want journalists to write articles about
d) Blogger: Make your own blog and write about stuff, put ads on it, and gain bitcoin
e) Tutorial writer: Write any tutorial, here in the forum aswell, and hope to get donations
f) Rewriter: Rewrite old articles or other manuscripts, some people will pay you for this, search the forum services board or the web for this
g) Copywriter: Write ads for bitcoin businesses
3] Mining
Requirements: Advanced PC knowledge, a starting capital to buy mining equipment, and knowledge about cryptocurrencies in general
Risk Level: Medium
Profit Level: Low
Reliability: Medium
Common Risks: Scammy mining pool, your mining equipment malfunctions, or you are just not efficient with mining and will lose money
a) Bitcoin Mining: Mining bitcoin via a bitcoin pool
b) Altcoin Mining: Mining altcoin via solo or via a pool
4] Services
Requirements: Some kind of advanced skills in a particular area so that you can give your services for sale
Risk Level: Low
Profit Level: Medium
Reliability: Medium
Common Risks: Getting scammed, Project dies
a) Escrow: You need a senior account with good reputation, and can be an escrow and earn bitcoin
b) Programmer: Sell your programming skills for bitcoin
c) Marketing: Help somebody promote his stuff, and get paid in bitcoin
d) Advisor: Offer your advising skills to somebody and earn bitcoin
e) Community organizer: Join a project and become a community organizer, the owner will pay you for doing it well
f) Other services from this forum: https://bitcointalk.org/index.php?board=52.0
g) Designer: Design ad banners, advertising material, videos or any other material that can easily be done for bitcoin
5] Products
Requirements: Some talent in an area so that you can create stuff and sell it or existing stuff for sale via a garage sale method
Risk Level: Low
Profit Level: High
Reliability: Low
Common Risks: Getting scammed, Copyright problems
a) Garage Sale: Sell your stuff for bitcoin
b) Musician: Compose music and sell it for bitcoin
c) Video maker: Make videos and sell it for bitcoin or Host some show on a video streaming platform and get paid in btc
d) Other Artist: Create paintings, sculptures, etc.. and sell it for bitcoin
e) Book writer: Write a book or an e-book or any essay/article and sell it for bitcoin
6] Entrepreneur
Requirements: Entrepreneur talent, knowledge a small starting capital and a good idea
Risk Level: High
Profit Level: Medium
Reliability: Medium
Common Risks: Business fails, you lose your money
a) Find a product or service that is profitable to do and do it as a full time business in bitcoin
7] Investing / Trading
Requirements: Starting capital, risk management skills and talent
Risk Level: Very High
Profit Level: High
Reliability: Medium
Common Risks: You can lose your invested money, Beware of Ponzi schemes
a) Invest/trade altcoins: invest or trade them, and then convert the earnings back into bitcoin
b) Bitcoin based investments: options, stocks, assets, derivatives, swaps, margin trading ,etc...
8] Lending
Requirements: Some basic capital to loan out
Risk Level: Medium
Profit Level: Low
Reliability: Medium
Common Risks: Tons of loan scammers so beware, you might lose your capital depending on how much collateral you have as insurance
a) Collateral loan: You take a collateral for the loan, and offer lower interest to the borrower
b) Non-collateral loan: Very risky, but if successful, you can charge higher interest rate from the borrower
9] Gambling
Requirements: Huge fucking luck, but it's doable or some skill
Risk Level: Very High
Profit Level: Very High
Reliability: Medium
Common Risks: You can lose your wagered money
a) Luck based gambling games: It is possible to win the jackpot in bitcoin, which are usually over 100,000$ worth in bitcoin
b) Skill based games: Poker, Sportsbetting, etc.. these require some skills and you can earn bitcoin this wayNOTE : THIS IS NOT AN INVESTMENT ADVICE, IT IS ONLY FOR EDUCATIONAL PURPOSES. THIS IS NOT A COMPLETE RISK ANALYSIS OF THOSE ACTIVITIES, THERE MIGHT BE MANY OTHER RISKS INVOLVED IN DOING THEM. I AM NOT ENDORSING ANY OF THESE ACTIVITIES, AND I AM NOT LIABLE FOR YOUR LOSSES IN ANY SHAPE OR FORM IF YOU LOSE BY DOING THESE ACTIVITIES.
Source : bitcointalk