Trump's I can understand given it was a huge anomaly. Obama/s however first three are critical to understanding the economy.
Not "much," but some was a result of utilizing existing assets. On the other hand, a recession destroys production capacity, so it may be difficult to expand output.
There wasn't anything special about Trump's Presidency. Note the economy never grew more than 3% annually during Obama's two terms or Trump's one term. Part of Trump's growth was caused by running larger deficits.