The list here https://www.bestchange.com/monero-to-bitcoin.html shows exchangers where you can exchange monero to bitcoin. The exchangers are sorted by the rate, with the best rates on the top. To select an exchanger, you may want to check its reserves and reviews. To exchange money, click on the exchanger you choose and go to its website.

I can recommend you a reliable cryptocurrency exchange Currency.com, which I have also been using for a long time. The platform offers over 200 different cryptocurrencies combinations to trade, including buy basic attention token Currency.com offers over 2,000 tokens that are pegged to the actual market prices of traditional asset classes