What are the biggest categories in online marketing?

Good evening.

I ran across a photo on my phone stating the seven major categories are:

1. Search Engine Optimization
2. Search Engine Marketing
3. Content Marketing
4. Social Media Marketing
5. Pay-Per-Click Advertising
6. Affiliate Marketing
7. Email Marketing

I'm in the process of learning such about online marketing. Does this list above seem accurate or is it missing something.

Thanks.

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