If you are using 又 to mean "again", then the starting point of understanding 又 is the start of your conversation
if everything has happened once and you are talking about another time something happened, then you can use 又
example
我星期一去了上班,星期二又去了上班。(With 又, you need a 了 after the verb)
In your question, you are using 又 to mean also, also, etc ...
又。。。又
also ... also
那家饭馆的菜又好吃,又便宜,又方便,又健康。
in your second example 也 means and or also ... and you would only need one 也 to link two verb phrases ...
wtih 也, both of the verb phrases must have the same subject ...
那个饭馆的饭便宜也好吃。