For intercity travel there is an excellent rail network. Within large cities use public transport (metro and/or bus). To get to remote places use bus or car. Ask about family reductions and the like.
Same as everywhere else. Mostly by road (trucks up to 40 tonnes), some by rail, and a certain amount of bulk commodities by water - there are many navigable rivers connectyed by various canal...
The fastest and easiest way to get around in Paris is to use public transportation, especially the subway system called here 'le métro'. Some faster lines, but with far fewer stops, belong to the...