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google.com
https://support.google.com/contacts/answer/7280886…
Edit or delete contacts - Android - Contacts Help - Google Help
After you add contacts to your Android device, you can make changes or delete them. Contacts saved to your Google Account will sync with Google Contacts and all your Android devices.
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google.com
https://support.google.com/contacts/answer/30970?h…
View, group & share contacts - Android - Contacts Help
You can organize the people and businesses in Contacts using labels. You can use the Contacts app to find someone’s contact info or organize contacts with labels like "friends" or "family."
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google.com
https://support.google.com/contacts/answer/7280886…
Edit or delete contacts - Computer - Contacts Help - Google Help
After you add contacts to your Android device, you can make changes or delete them. Contacts saved to your Google Account will sync with Google Contacts and all your Android devices.
Global web icon
google.com
https://support.google.com/contacts/answer/7078226…
Merge duplicate contacts - Android - Contacts Help - Google Help
If you have duplicate listings for the same person in Google Contacts, you can merge them. You can't merge contacts that are saved in different Google Accounts.
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google.com
https://support.google.com/accounts/answer/7345608…
Change who's saved & suggested as contacts - Android - Google Help
People you've interacted with in Google services are automatically saved to "Other contacts." In some apps, like Gmail or Photos, you may see suggested contacts before typing or searching for anything. Tips: You can stop automatically saving contacts at any time. You can touch and hold on suggestions and hide them.
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google.com
https://support.google.com/contacts/answer/1069522…
Add or move contacts - Android - Contacts Help - Google Help
You can save names, email addresses, phone numbers, and more in Google Contacts. Contacts saved to your Google Account will sync with Google Contacts and all your Android devices.
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google.com
https://support.google.com/contacts/answer/7199294…
Export, back up, or restore contacts - Android - Contacts Help
You can back up the contacts stored on your phone or SIM card. If you lose or need to replace your phone, you can restore these contacts on the new phone. Restoring data varies by phone and Android version. You can't restore a backup from a higher Android version onto a phone running a lower Android version.
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google.com
https://support.google.com/messages/thread/2864578…
How can I remove someone from a group chat that I created?
Regrettably, Google Messages does not provide a direct way to remove individual members from an existing group chat that you've created. Once a group chat is formed, you cannot selectively delete participants from it.
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google.com
https://support.google.com/messages/thread/3009412…
How can I permanently delete text messages from my android phone ...
Open your messaging app. Select the conversation or specific messages you want to delete. Tap on "Delete" or the trash icon to remove them. To ensure the data is completely gone, go to Settings > Apps > Messages > Storage > Clear Data.
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google.com
https://support.google.com/messages/thread/2396872…
Delete Contacts from New Conversations - Google Help
RCS is now available for texting between Android and iPhones. Learn how to turn on RCS chats on your Android phone (link).