If you are looking for a digital currency with a strong future for investment or trading, there are several factors to consider such as: technology, development team, use cases, market acceptance, and financial sustainability**. Here are some tips and notable currencies that are viewed as promising options:

*Tips for choosing a strong digital currency:*

1. Technology and Innovation:

- Look for projects that use innovative technologies such as scalable blockchain, advanced smart contracts, or layer solutions.

- Examples: Ethereum (ETH) with its updates, Solana (SOL) with its high speed.

2. Real-World Use Cases:

- Currencies that are used in real applications (such as decentralized finance - DeFi - gaming - GameFi, or web3) tend to be more sustainable.

- Examples: Cardano (ADA) in education, Chainlink (LINK) in data connectivity.

3. Team and Background:

- Projects with experienced teams and strong partnerships (such as Polkadot (DOT) or Avalanche (AVAX)) are more reliable.

4. Liquidity and Market Acceptance:

- Currencies available on major platforms like Binance or Coinbase are less prone to manipulation.

5. *Regulatory Compliance*:

- Some currencies focus on compliance with laws (such as XRP in banking transfers).