dependent tasks

Hello - my first day with zoho project and first time with any kind of PM software!
Found the Gantt chart - liking that so far, but a few questions......

Is there a way to make one task or task list dependent on another task/task list; so could I say task B starts when Task A is completed for example? And if this is possible, can the links be visible on the Gantt chart? Also, can the name of the person who is responsible for a task be visible on the Gantt chart (not just when you hover over the bar). I saw someone else post about exporting the chart as a pdf and I am definitely interested in this function.

Thanks.