I was told that I shouldn't jump start another car with my 2008 Honda Civic. Is this information true or false? What about jump starting a big truck?

I have to disagree with the previous answer. Though it is a kind act to boost someone dead on the road and feels good to help, this this is like many other things in life which you can do but you shouldn't and specifically in the context you are asking " boosting a big truck". I would not Jump any Trucks with my Honda. Heavy vehicles such as large trucks, excavation equipment, or vehicles with diesel engines may use 24-volt electrical systems. They usually have a 24V supply using two 12V automotive batteries in series: it is therefore possible to jump-start a vehicle with a 12V electrical system using only one of the two batteries but it can suck the life of your battery depending on its condition and you may end up with a dead battery down the road a week later. Furthermore, motorists can be severely injured by a battery explosion. In the United States in 1994, a research note by the National Highway Traffic Safety Association estimated that about 442 persons were injured by exploding batteries while attempting a jump-start and it is a very ugly scene because if you are in front of the car you will be doused with acid (if you get 98% Sulfuric Acid in your eye it will be blinding) as well as your fenders and everything within a 10 foot radius (your car will need to be towed) and everywhere acid spilled will be eaten or corroded within hours including your corneas within 15 min. Note: If you are still bent on doing the deed observe polarity: the donor battery black cable should be grounded to frame away from battery & positive to red post - recipient (dead batt) will connect black 2 black, red 2 red & step back a good 7-8 feet in case and tell the dead guy to try starting his car if it does disconnect always the ground from your car first. http://www.sightandhearing.org/sightcenter/battery.asp