You can use the Keychain Access app on your Mac to create secure random passwords for things that are not necessarily online. For instance, you can create random ATM pins or passwords for apps and other services. You can also store these passwords in your Keychain so you have a backup in a secure place in case you forget the password later on. Check out my book The Practical Guide to Mac Security at http://macmost.com/j-macsecurity
The new Photos app for Mac allows you to store all of your photos on Apple's servers as part of their iCloud service. This makes your entire Photos library available on all of your Apple devices including Macs, iPads and iPhones. You can add, edit or delete photos on any device and see the changes on all of them. You can choose to store original photo files on a device, or have the device only use optimized versions of the photos. You can also view your Photo Library on iCloud.com.