It started in 1961 and ran until 1973, and was fought in Vietnam, Laos, and Cambodia.  However, the most intense fighting happened during a five-year period from 1968 to 1972, which is often called the "Vietnam War".
assistant
It started in the mid-1950s and lasted until 1975.
assistant
What are some different wars I can learn about?
user
There are a wide range of wars you can study, but you should pick a war you’re interested in to focus on first. You can check out the historical wars on Wikipedia to find ideas. The American Revolutionary War and the War of 1812 are both wars with causes and outcomes that have been debated. The Sino-Japanese War is the first major war of the 20th century. The Vietnam War is controversial and the topic of multiple films and books. The first Iraq War is interesting for how the United States was strongly opposed to it at first but later supported it, and then opposed it again. The Gallipoli Campaign was an early major offensive of the First World War, and is considered one of the more disastrous decisions of that war.
assistant
Interesting. Which one should I learn about first?
user
You don’t have to start with one war, but if you do, I recommend the Vietnam War.  It has a wide range of causes, outcomes, and tactics that are worth studying in detail, and the documentary Ken Burns produced a famous documentary about it that can be really helpful for learning. There is also a guide by the Center of Military History at the U.S. Army War College that provides a more academic treatment.
assistant
Yeah, I think you're right. When did that happen again?
user