Which strategies should be strictly avoided in SEO 2021?

1. KEYWORD STUFFING
2. EXACT KEYWORD MATCHING
3. SPINNING CONTENT
4. BUYING BACKLINKS

Keyword stuffing.
Exact Keyword matching.
Spinning Content.
Buying backlinks.

Keyword Stuffing
Duplicate Content
Cloaking
Doorway Pages
Link Farming
Spamming in Blog Comments

Mistake 1: Not setting clear SEO goals
Mistake 2: Ignoring search intent
Mistake 3: Overlooking mobile traffic
Mistake 4: Holding onto old school SEO best practices
Mistake 5: Buying backlinks