Basically, the plan was generally 10-15% baseline tariff across the board for all countries, and higher rates for sectors such as steel and aluminum.
US manufacturers will get used to decreased competition, which will lead to poor quality and decreased innovation.
Smuggling will increase, particularly from Canada. Instead of going to the Apple store to buy your next phone you will agree to meet a stranger in a dark alley and pay cash to buy a smuggled iPhone.
The tariffs will be felt by poorer Americans while the rich will barely notice.
It's only possible to have tariffs now because people don't grasp the consequences. When prices go up, the tariffs will be less popular.