Login or register for a new Coinbase account.
If you’re having an issue becoming eligible you might have to verify your account to a level 3 account. 
Then go here and go through the lessons to earn $20 in Dai.
Go here and take the lessons to earn $10 in EOS.
Go here and take the lessons to earn $10 in XLM.
Go here and take the lessons to earn $10 in BAT.

Once you’re done you can either keep it in your Coinbase portfolio, or sell and withdraw your cash to your paypal or bank account..
Update– You can earn $6 in Tezos by going here and taking the lessons.
Update 2 – You can earn $12 in OXT by going here and taking the lessons.
Update 3 – You can earn $9 in COMP by going here and taking the lessons.
Update 4– You can earn $6 in CGLD by going here and taking the lessons.
Update 5– You can earn $6 in MKR by going here and taking the lessons.
Update 6– You can earn $6 in ALGO by going here and taking the lessons.
Update 7– You can earn $6 in ZEC by going here and taking the lessons.
Update 8(12/9)– You can earn $4 in BAND by going here and taking the lessons.
Update 9(12/12)– You can earn $6 in FIL by going here and taking the lessons.
Update 10(12/12)– You can earn $19 in COMP by going here and taking the lessons.

Update 11(12/21)– You can earn $3 in GRT by going here and taking the lessons.
Update 12(2/6)– You can earn $3 in NU by going here and taking the lessons. Answers are: End to end, Independent, and Paying.
-Update 13(2/26)– You can earn $3 in NMR by going here and taking the lessons. Answers are: Community of data scientists, To back up predictions, and Nothing.
-Update 14(3/27)- You can earn $6 in UMA by going here and taking the lessons.