This is the 485th most frequent Czech word.
šlo
"Šlo" means "went" or "it went" in English.
The word "šlo" here is the past tense form of the verb "jít" (to go) and is used to describe how something progressed.
Včera to šlo docela hladce.
Yesterday, it went quite smoothly.
Here, "šlo" is used in a conditional question to politely inquire if something is possible.
Šlo by to nějak zařídit?
Could that be arranged somehow?
In this case, "šlo" indicates that something was feasible or possible to accomplish in the past.