How to know if a SEO company is Legal?

[santonu911]

what’s the easiest way to learn and understand what one ethical SEO firm is actually?

[kevin619]

An ethical SEO firm is one that only uses white hat SEO techniques (as opposed to black hat). Black hat techniques might have huge benefits at first, but they are also very risky and can get your site blacklisted by Google because they use shady techniques against Google's policies. Examples of black hat SEO are buying text links from other sites instead of growing backlinks organically.

[sea queen]

There is no authentic way to check it you can only check the company profile and how project it's should be done.

[Prakashbabu]

There are no way to identify the company legal or illegal.