Macbook: how to initiate a backup now using Time Machine

System Preferences - > Time Machine
Then select Disk to backup
Then right click on the icon of that disk with a clock logo --> Back Up Now

Erase process has failed : cannot erase a disk using disk utility on Mac

One potential solution:
try unmounting the disk. There might be problems affecting this disk / programs currently using this disk.

How to see an outline of your word thesis article --- using document map

On mac,
View - > Sidebar -> navigation
thumbnail is also a good function

How to make a transparent background white for an image using Powerpoint

You need to use the fill function

Double click the image, Format Picture panel -> Fill -> choose white color

how to sync/link/share contacts between different Google/Gmail accounts?

You can export and import contacts.

1. Go to google contacts: https://contacts.google.com/
2.Use the export to save your contacts
3. log on to your other account
4. use the import to load your saved contacts

How to change siri voice

settings -> siri & search

how to adjust iphone text sizes

settings -> general -> accessibility ->  larger text -> move the bar at the bottom part