As far as exchanges, for CEX Kraken (U.S.), for Dex https://kycnot.me/ has a list of good resources.
The two most common I hear are Haveno, and Bisq.
Personally, I use nostr:nprofile1qqsfzszrtw60ut24h28k0qy3cdyxhvpp2zx4lwyqzdfm7xwjsaxsj2qpzamhxue69uhhyetvv9ujumn0wd68ytnzv9hxgtc7qsr78, and nostr:nprofile1qqsgwj2rmdtuy3q572yj7y38sxlzr86usjck02merrevurvnn86yqncpzamhxue69uhhyetvv9ujumn0wd68ytnzv9hxgtcctk22m for multicoin purposes but I recommend nostr:nprofile1qqsgdtejeuhys8ucl7gc3j8v4t04959kvqdvptpq06zuwjkrc6l0x4spzamhxue69uhkzarvv9ejumn0wd68ytnvv9hxgtcpzemhxue69uhk2er9dchxummnw3ezumrpdejz7qgswaehxw309ahx7tnnw3ezucmj9ug8fu5s https://www.monerujo.io/ if you're looking for a Monero only experience.
Alternatively you can check out https://xmruw.net/
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