Hey all, I've just started my journey to the SEO world, and I am so confused by keyword research. Could anyone help me with the following questions? I'll be extremely grateful :)

1. How do you cluster/group your keywords?

2. Which tools do you use for that purpose?

3. How many keywords should the research contain?

Thanks in advance!

(if anyone can share a done sheet with keyword research, I'll present you my soul :D)