Here are the 8 steps to plan SEO Strategy:
Step 1: Define your target users and their requirements
Step 2: Categorized keyword research
Step 3: Finding gaps and opportunities
Step 4: Define Competitors
Step 5: Spying on your competitors
Step 6: Customized SEO strategy & recommendations
Step 7: Must-have SEO recommendations
Step 8: Prioritize and summarize
You can enroll in this SEO Course by Intellipaat to learn SEO.
Also, watch this video on SEO strategy: