Sync Reminders across devices using iCloud or other email accounts
Reminders may be stored on iCloud or other email Accounts as shwon in the pic below.
To have the reminders on other devices simply add the account in all the other devices.
Get insights from experienced community members
Community members who reach Level 5 in the community can create User Tips to share knowledge about Apple products. Check out this User Tip created by Lawrence Finch: When to charge your iPhone or iPad
Community members who reach Level 5 in the community can create User Tips to share knowledge about Apple products. Check out this User Tip created by Lawrence Finch: When to charge your iPhone or iPad