What are some best practises for Altcoin minting?

[madhavanmalolan]

Bitcoin, Ethereum and the like have their own way to add coins in circulation through mining rewards. This keeps the economics (inflation vs liquidity) in balance.
How do altcoins/ERC-20s introduce coins in circulation?
The ones that i have seen either have a fixed supply or are minted by a central authority.

What are the best practises for introducing more coins? What are the market/economic dynamics one should be aware of before making this decision?
Are you aware of some coins that have an innovative approach on this?