Great questions! In order to ensure the security of users' funds and personal information, reputable cryptocurrency exchanges typically implement strict security measures, such as two-factor authentication, encryption, and cold storage of funds. In addition, they may also have insurance to protect against potential losses. Regarding trading limits, it will depend on the specific exchange, but most will have some sort of limit on trading volume and transaction size. As for customer support, most exchanges will have various options such as email, live chat, or phone support. It's important to do your research and choose an exchange that has a good reputation for security and customer service. For more tips on protecting your assets when exchanging crypto, check out this informative article: exchange crypto https://archzine.es/lifestyle/proteja-sus-activos-consejos-para-evitar-fraudes-al-cambiar-bitcoin-por-euros/