How to do Google Adwords Certificate??

Good. Thank you for sharing this.

To increase backlink:
1) Need to know the high page authority and domain authority website
2) To participate in Directory submission
3) To participate in Forum discussion
4) To participate in Blog commenting
5) To participate in Video sharing

Some of the main terms and categorize in Digital Marketing are as follow:
1) Search Engine Optimization
2) Search Console
3) Content Optimization
4) Google Adwords
5) Google Adsense
6) Social Media Marketing