What is the best way to earn miles?

Milelion website would have the best strategies available. Current best card available is boc's elite miles card. But there's a long processing period now.

you can check out this app called Mileslife. https://www.mileslife.com/#/

From their homepage, it says ' When you pay through Mileslife, you get extra miles on top of your credit card earnings. Earn miles with a wide selection of merchants and credit them to your preferred airlines. The fastest way to earn miles has just arrived. ' Its pretty self explanatory haha.

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Another way is through CardUp. https://cardup.co/

From their homepage, 'Get more miles, points and cashback when you make big recurring payments with your credit card – even if your recipient doesn’t accept card payments'. This means that you can pay for bills and loans via this method, thus earning you miles/points/cashback.

The cons of this is that there is a 2.6% commissionfor every transaction.