Joust, for the most part, is a smaller scale version of the traditional Conquest mode. The teams are smaller (going from 5v5, like most other game modes, down to 3v3), the map is smaller (to a singular lane, much like assault but shorter), but the action is still all there. The main goal of the game is to slay the enemy's titan, which is protected by a phoenix placed right in front of the titan room, and a tower that's just a little bit farther out.
What Conquest players get stuck on, from my experience of talking with the community, is what Gods to choose. Even though there's a meta that relatively circulates around all game modes (ex. some Gods have stronger damage numbers, or better scaling than others), the way Joust is played changes things just a little bit. There's a number of different team comps that work well in Joust, wether it be the two tank comp, the tradiotional Mage/ADC/Tank, or something else, there's many paths to success, and it's all up to the players to choose. This is something I covered in a recent video on my YouTube channel, which I'll link down below.
Another big difference between Conquest and Joust is objective play. Conquest has LOTS of objectives to go after around the map (ex. Pyromancer, Gold Fury, Fire Giant, Totem) and then a whole lot of farm surrounding that, meaning that there's ALWAYS something to be doing and going after, farming patterns to be followed and objectives that need to be prioritized over other decisions. Joust is a bit different, however. Your primary objective for Joust (aside from killing that pesky enemy titan) is the Lost Knight, which grants a temporary buff to the team that lands the final blow, as well as applying a debuff to the enemy teams' next structure. The tower and phoenix will be disabled, and WILL NOT attack for a short amount of time, meaning that the team that killed the Lost Knight will have an easy oppertunity to destroy a structure, but they'll need to move quick before the timer runs out.
A good secondary goal for Joust is camp control. This isn't talked about too much with Conquest, considering there's so many camps all around the map. But in Joust, there's only 4 camps on the map. Aside from minion waves and killing enemy Gods, this is the only way you're going to gain experience. Maintaining control over the neutral camps (the red camp by the teleporter and the purple camp close to the Lost Knight) will guarantee an experience advantage over your enemy, making your odds of winning fights that much better. This style of play was especially relevant during K-Money's K-O, a Joust tournament that took place on March 15th, where former Founder's Series Finalists Sap7 and Karmic took home the cash prize.
Here's the link to the YouTube video that I put out that talks about Joust team comps, and if you made it this far into the read, thanks much for your time!!