Donald Trump is a former President of the United States who served from 2017 to 2021. During his presidency, he implemented various policies and initiatives, some of which are listed below:

• Tax Reform: As president, he signed a major tax reform bill into law.

• Reduced Federal Regulations: He oversaw a reduction of federal regulations.

• Trade Policies: His protectionist trade policies included tariffs on foreign aluminum, steel, and other products. The Trump administration also renegotiated trade agreements with Mexico, Canada, China, Japan, and South Korea.

• Travel Ban: He ordered a travel ban on citizens from several Muslim-majority countries.

• Border Policy: He implemented a policy of family separations for migrants detained at the U.S. border.

• Environmental Protections: He weakened environmental protections, rolling back more than 100 environmental policies and regulations.

• Social Media: He used the social media platform Twitter as a primary mechanism for direct communication with the American public, other politicians, and the press corps.

• Impeachment: He became the first president ever to be impeached twice – the second time for inciting an insurrection at the U.S. Capitol.

These are just a few examples of what Donald Trump did during his presidency. It is important to note that opinions on his presidency and policies are divided and controversial.