Do you like to hike and climb mountains?
Yes and i have been to Mount Everest. It is the Earth's highest mountain above sea level, located in the Mahalangur Himal sub-range of the Himalayas.
Wow Mount Everest.  Have you climbed to the top?
Yes. It is very tall, i know. The new height by China is 8844.43 m and  There followed an argument between China and Nepal
About how long does it take to reach the top?  I imagine it's strenuous.
It takes days and Mountaineering  require experience, athletic ability, and technical knowledge to maintain safety.
From what I hear, a lot of people are injured or die attempting to climb Mount Everest.
Yes that is the part of Mountaineering  where technical difficulties frequently exceed environmental and physical challenges.
How does someone go about training for something like that?
Wellm just like any other sports,  the sport of mountain climbing should have some basic training before going to the outside world