From my 17+ years experience, here’s the important skills; (this is completely my own opinion)

1. Confident of English language
2. MS-Excel & Powerpoint Knowledge
3. Blogging skills by having your own website
4. Decent understanding of digital marketing channels, and specialization in any one subject with in-depth knoweldge
5. Google Analytics & Google Search Console knowledge
6. Confidence in Keyword Research & Adcopy Writing
7. Referring specific reference sites around digital marketing
8. Knowledge of 3rd Party tools incl. SEMRush, Ahrefs, MOZ, MajesticSEO, ScreamingFrog, Buffer
9. Good with reporting templates in Google Data Studio
10. Able to integrate Google Tag Manager
11. Being able to plan & strategize the work task on Quarterly, Half-yearly & Yearly targets