Basically in fact, according to the wishes of the investor, the nature of the transaction as well as the size and complexity of each investment deal, investors can propose many types of Due Diligence.
There are basic types of due diligence:
Legal Due Diligence: Legal evaluation of businesses
Tax & Financial Due Diligence: Tax and financial due diligence of the business
Commercial Due Diligence: Appraisal of the market as well as the startup activities of that market.
Depending on the wishes of the investor, there may be other Due Diligence. For example, they will assess the personnel, labor, environment or even intellectual property rights of the business.