how many Types of SEO Services?

[Kenank]

Three types of SEO techniques are there:

White-hat SEO: Manual link submissions, follows Google (and other SE) TOS and Guidelines, time-consuming, effective.

Grey-hat SEO: Breaking a rule or two, usually when you know how to use black-hat tools properly and efficiently, makes use of SE (search engine) courtesy and human emulation settings, uses proxies, etc. Just as effective.

Black-hat SEO: Unethical SEO practises, unrelated, spammy backlinks, mass submission (low delay settings if any), uses proxies, fast automation tools. Also effective, short-term unless you really know what you're doing. Can easily cause Google penalties in the wrong hands.