See the tutorial on Instruvìctables https://www.instructables.com/id/Digital-Wallet-Arduino-Based/
How many password do you have? How many social profile or cloud tools do you have? How many computer do you use in your week? Many of this computers are yours? Only you have access to this machines? No?
Hardware
Arduino micro (https://amzn.to/2lnIBCD)
Usb cable (https://amzn.to/2tmDWnO)
Adafruit OLED display SSD 1306 (https://amzn.to/2I8Oix6)
Micro buttons (https://amzn.to/2yAuseu)
Protoboard (https://amzn.to/2Ia4CgY)
Software
Arduino IDE (arduino.cc)
Arduino Libraries:
Keyboard library
SPI library
Wire library
Adafruit_GFX library
Adafruit_SSD1306 library