Several cryptocurrency exchanges were highly regarded within the crypto community for their security, user interface, liquidity, and range of supported assets. However, please note that the landscape can change rapidly due to regulations, security breaches, or shifts in user preferences. Here are some exchanges that were frequently recommended:

1. Binance: Binance is one of the largest cryptocurrency exchanges globally, offering a wide range of cryptocurrencies for trading. It was founded in 2017 by Changpeng Zhao and has since grown rapidly to become a dominant force in the crypto space. It provides advanced trading features for experienced traders as well as a user-friendly interface for beginners.Binance is one of the largest and most popular cryptocurrency exchanges in the world.

1. Coinbase: Coinbase is known for its user-friendly interface making it the best crypto app for beginners. It supports a variety of cryptocurrencies and is one of the most trusted exchanges in the industry providing low trading minimums and extensive cryptocurrency education. For more experienced users, Coinbase offers Coinbase Pro, a platform with advanced analytics and trading tools.

1. Kraken: Kraken is a well-established exchange known for its strong security measures and wide range of supported cryptocurrencies. It offers advanced trading features suitable for both beginners and experienced traders. Kraken offers a wide range of cryptocurrencies for trading, including major coins like Bitcoin (BTC), Ethereum (ETH), and Litecoin (LTC), as well as a variety of altcoins and tokens.

1. Bitfinex: Bitfinex is a popular exchange known for its advanced trading features, liquidity, and margin trading capabilities. It offers a wide range of cryptocurrencies and trading pairs.

1. Gemini: Gemini is a regulated cryptocurrency exchange based in the United States. It is known for its strong security measures, regulatory compliance, and user-friendly interface.

1. Bittrex: Bittrex is a US-based exchange known for its security and reliability. It offers a wide range of cryptocurrencies and trading pairs, making it suitable for both beginners and experienced traders.

1. Huobi: Huobi is a global cryptocurrency exchange that offers a wide range of cryptocurrencies and trading pairs. It provides advanced trading features and is popular among traders worldwide.

1. FTX: FTX is known for its innovative products and features, including tokenized stocks, futures, and options. It has gained popularity among both retail and institutional traders.

1. OKEx: OKEx is a global cryptocurrency exchange that offers a wide range of trading products, including spot trading, futures trading, and options trading. It provides advanced trading features and has a large user base.

It’s essential to conduct your own research and consider factors such as security, fees, supported cryptocurrencies, trading features, and regulatory compliance when choosing a cryptocurrency exchange. Additionally, always prioritize security by enabling two-factor authentication and using secure passwords.