Ehm,

- Mining Monero
- Trading goods or services for XMR
- Providing freelance work on platforms that pay in Monero
- Participating in Monero bounty programs or development efforts
- Arbitrage trading between exchanges (cex vs dex)
- Staking in Monero lending platforms (very risky)
- Running a Monero node and offering services (like VPNs) for XMR payments
- Accepting Monero for business transactions (e-commerce, etc.)

Probably more ...

 

 How to mine? 

 https://xmrig.com 

 What is the best way to mining Monero at home? 

 Depends on what you mean by best. Since you said earn, probably the fastest way would be mining. At least to get something. But the better way to get more would be to go on XMRBazaar and become a proxy merchant. The problem is the platform is still growing, so it could be a while before somebody even places an order