If you can finish the campaign on Master, you'll be pretty decent in multiplayer too in short order. Also can recommend Frontier Defense, it's a multiplayer co-op mode that reinforces good multiplayer skills and allows you to get used to the maps

This was my experience on the Xbox. Absolutely loved the campaign. Could not get a feel for how to survive mp after a few hours. There was a prolonged respawn and die nearly immediately loop. I uninstalled it after I got what I could from the campaign.

The best tip is to focus on killing ai in the Attrition mode, and stay near teammates. But the wave defense mode is fun too, as you level titans they get overpowered upgrades which would be too unbalanced in versus mode.