There is no real such thing as passive income. You need to know what you are putting your money into before you invest it. You need to know what they stand for, the promises that are being made, whether or not the people who are making them can stand behind that promise. A lot of people are losing money in the crypto world, because they are just following the crowd.
If you want to make money by investing in something that will stand the test of time, this list is a good place to start doing your research.
Top 50 Cryptos and What they Stand For
BITCOIN - digital gold, grandfather of crypto, store of value
ETHEREUM - smart contracts
RIPPLE - connect banks, payment providers, digital asset exchanges and corporates
BITCOIN CASH - Claims to be the Bitcoin closest to Satoshi's vision, Non-segwit
LITECOIN - Bitcoin, but fast and cheap
DASH - Digital cash
NEM - Smart asset system
NEO - Smart contract platform, like Ethereum, but more languages
MONERO - The only true private coin, No rich list for Monero!
IOTA - Tangle architecture instead of a blockchain, No fees!
ETHEREUM CLASSIC - Bagholders who didn't like the DAO hack being reversed
OMISEGO - SE Asia finance and payments company. Currently using ERC 20 token, but are building their own blockchain
QTUM - Smart contract platform, proof of stake
ZCASH - Privacy coin with optimal privacy
LISK - Blockchain application platform using sidechains
TETHER - Basically digital USD, except not really. Never been auditted to see if they actually hold enough money to cover the amount of tether.
WAVES - Platform for releasing your own crypto
STRATIS - Blockchain with multiple applications including identity
STELLAR - Open platform for building financial products
STEEM - Reddit, but crypto dollars
HSHARE - Alternative Chinese digital cash (possible scam according to Reddit)
BYTECOIN-BCN - Another anonymous privacy coin
ARK - Platform for linked blockchains
EOS - Smart contract platform
ARDOR - Blockchain as a service platform
TENX - Crypto credit card
AUGUR - Crypto prediction markets
GAS - The currency of NEO ecosystem
BASIC-ATTENTION-TOKEN - Next-gen digital advertising. Made the Brave browser
KYBER-NETWORK - On-chain exchange & Payment system
KOMODO - Decentralized ICO Platform
MAIDSAFECOIN - Decentralized internet (data network)
PIVX - Another privacy coin
DECRED - Credit currency
WALTCOIN - RFID tags on the blockchain, something about China and sweatshop workers. We will probably find out after China FUD
GOLEM-NETWORK-TOKENS - Decentralized computing power
ICONOMI - Digital asset platform
SALT - Secured Automated Lending Technology (AKA Crypto loan sharks)
DIGIXDAO - Buying gold, I think
TRON - I don't really know. Their page was in Chinese (if anybody knows, please leave a comment)
BINANCE COIN - Exchance, Binance tokens lets people change with significantly less fees
FACTOM - Storing real world contracts in the blockchain for data integrity and assurance
CHAINLINK - Attempting to bridge the gap between blockchain and real-world cases
FIRSTCOIN - Company start ups
SIACOIN - Decentralized data storage
GAMECREDITS - Buy and sell video games
METAL - A currency
BITSHARES - Decentralized exchange
I hope this helps!