It can get tricky sometimes; I find using more specific words like "questioned," "replied," "stated," "retorted," "snapped," "mumbled," etc. where applicable can be effective to prevent it from becoming all "said". There are some very comprehensive lists out there (often including words that are probably more academic than practical.) Also, if you're continuing a dialog between two characters you can sometimes just have it go back and forth in a pattern the reader can understand. E.g: 'Marcus looked out over the chaotic maze of streets and back at Bion. "You do know how to get us there, right?" "'Course I do." Bion replied. "So, you've been before?" "Nope." "Then how do you know?" "I asked a farmer headed out the gates." "A farmer?" "Yeah. And?" "I'm gonna ask someone else."' (I don't know if that was a very good example, but hopefully you get the idea)

I also found that you can also use context clues to show the reader who is talking, for example,

Her father nodded sternly, “Your mother is right, you have no business going around and treating others like they are lesser than you!”

I definitely agree with both @Ian G. and @Jo4life . It's best to be careful with using too many different dialogue tags like "mused" "expostulated" and "ejaculated" - those are really unnecessary, in my opinion, at least! But yeah, my advice would be to use "said" for most of the time, use more descriptive tags like @Ian G. gave examples of, and give necessary context clues every now and then when you're not using "said."