I am going to be a DM of D&D 5e for my two friends, and they asked me which classes work well paired together. I have only played games with parties of four player characters before, though, so I don't know how to answer them.
I want to find out: what classes can work well together? By that I mean classes that have synergy together. An example would be a Cleric and Fighter as a Fighter can go through a dungeon and be constantly healed by his Cleric.
An example of non-synergy — the kind of thing I'm trying to avoid — is something like a Fighter and a stealthy Rogue with low health or defences. When the Fighter goes into combat, the Rogue can't participate; and when the Rogue wants to do something stealthily, the Fighter can't do much to help. The two have limited situations they can cooperate in, and where they specialise the other is useless! This won't be much fun for either of them, and I'd like to avoid us running into this situation.
So, how can I make sure my players have classes that can cooperate and regularly be useful to each other?