What are the best crypto currencies to invest in to hold until 2024?

Predicting the best cryptocurrencies to hold until 2024 involves a level of uncertainty, as the market can be influenced by various factors. However, as of my last knowledge update in January 2022, here are some cryptocurrencies that were notable. Please note that market conditions can change, and it's crucial to conduct up-to-date research before making any investment decisions:

1. **Bitcoin (BTC):**

- Often considered a store of value and a long-term investment.

- Institutional interest and widespread adoption contribute to its stability.

2. **Ethereum (ETH):**

- Continues to be a key player in the decentralized finance (DeFi) and non-fungible token (NFT) spaces.

- The transition to Ethereum 2.0 aims to improve scalability and energy efficiency.

3. **Cardano (ADA):**

- Known for its focus on sustainability, scalability, and interoperability.

- Ongoing development and potential for decentralized applications (DApps).

4. **Polkadot (DOT):**

- Aims to facilitate interoperability between different blockchains.

- The parachain model allows for increased scalability and customization.

5. **Solana (SOL):**

- Gained attention for its high throughput and low transaction costs.

- Attracted various decentralized applications and projects.

Always conduct thorough research, consider your risk tolerance, and stay informed about the latest developments in the cryptocurrency space. Consulting with a financial advisor is also advisable before making any investment decisions.