It comes from the party that nominates him. The party gets its money from campaign contributions. There is also public funding for those who accept it.
There are restrictions on how campaign money is raised. The bottom line is that most of the serious money comes from rich people and organizations who expect to be heard if they need something from the president. Some contribute to both sides .
In the US, running for public office is often expensive. Incumbent presidents or new nominees, receive funds from private sources such as "super packs" or funds directly from the political party they are a member of. In rare cases sometimes the funds used may be the candidates own money.
The US Secret Service provides protection for retired Presidents as part of their mandate to protect former Presidents and their families. This protection is offered for the lifetime of the former President, unless they decline it after leaving office. The purpose is to ensure the security and safety of the former Presidents and their immediate family members.
Yes. There are many documented instances of Presidents' swearing while in office.
Eight
Presidents can fight in wars, but they can't fight while in office.
2001
yes.
lawyers doctors
Kennedy and Cleveland
One, clinton
This depends on the country. Some Presidents have become millionaires or billionaires by stealing from their country. US: Barack Obama is known to be a millionaire. Much of his income came from politics including his stint as a senator, and his eventual 8 years as president. He also earned significant other income from writing books.
Theodore Roosevelt was a former US President and a candidate for that office when he was shot and wounded.
Yes, quite a few US presidents had dogs while in office. See the link below for a rundown of White House "pets."