This Practice Note summarizes the key securities laws, rules, and regulations that are most applicable to the securities offerings of a startup, including the Securities Act of 1933, the Securities Exchange Act of 1934, Section 4(a)(2), Regulation D, Rule 504, Rule 506(b), Rule 506(c), bad actor disqualification, Regulation A+, Regulation Crowdfunding, the JOBS Act, blue sky laws, Rule 701, Regulation S, intrastate offering exemption, securities fraud liability and integration rules. This Note also summarizes several rules that are applicable to the resale of unregistered securities, as well as the possible consequences the startup could face if it does not comply with securities laws.