Best credit building credit cards

[BrittanyStacy]

My boyfriend needs to buy a house but his credit score is low. What card would be the best to build up in a short period of time? 

[Anonymous_]

Review the information at the sites below.

https://www.nerdwallet.com/best/credit-cards/bad-credit

https://www.creditcards.com/secured/

https://creditcards.usnews.com/starter-cards-for-building-credit