Moved from Algo minimum balance of an address and Algorand network dapp - #12 by cusma
- Algorand smart contract code can be updated. However be aware that the amount of storage cannot change. Thus, you may want to add some security margin in the storage size. Smart contract details - Algorand Developer Portal
- There is currently no official best practices. However, I would recommend looking at Algobuilder that provides contract unit testing and many tools facilitating deployment of smart contracts: https://algobuilder.dev/