What's the smartest way to use public transit in Paris?

Buy a Navigo Easy card at any metro station for €2, then load it with carnets of ten t+ tickets (currently around €17.35 for ten) rather than paying €2.15 per single ride. If you're staying a full week and plan to move around constantly, the weekly Navigo pass covers all zones Monday through Sunday for roughly €30 and pays for itself quickly. The Paris metro runs until about 1:15 a.m. on weeknights and 2:15 a.m. on Fridays and Saturdays, so late dinners in the Marais or Oberkampf are rarely a taxi situation. One t+ ticket covers any single metro or bus journey within the city, including transfers between lines, as long as you don't exit the system. Avoid buying tickets from the machines in tourist-heavy stations like Châtelet during peak hours; the queues are slow and the RER platforms there are genuinely confusing even for regulars. The bus network is underused by visitors and often faster above ground between arrondissements on the Right Bank.

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• Where do locals actually go for aperitivo in Paris?
• Where do locals drink coffee in Paris?
• What does a local breakfast look like in Paris?
• Where is the street food in Paris actually good?
• Where can I eat after midnight in Paris?
• How do I get from the airport to the city in Paris?