bald
soon
In a short time; in the near future.
Keine Sorge, der Bus kommt bald.
Don't worry, the bus will come soon.

soon / almost
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soon
In a short time; in the near future.
Keine Sorge, der Bus kommt bald.
Don't worry, the bus will come soon.

As a time adverb, 'bald' (soon) can stand in different positions in the sentence. If it stands at the beginning (position 1), the verb follows directly after it.
Bald fängt der Film an.
The film will start soon.
The meaning of 'bald' depends on the context. If it refers to time, it means 'in Kürze' (soon/shortly). If it refers to an amount or a state, it means 'fast' (almost) or 'beinahe' (nearly).
Wir sind bald da.
We'll be there soon.
'Bald' is part of several fixed and useful expressions. 'Bis bald!' (See you soon!) is a common farewell, and 'so bald wie möglich' (as soon as possible) means that something is urgent.
Bitte schicken Sie mir die Unterlagen so bald wie möglich zu.
Please send me the documents as soon as possible.
The structure 'bald ..., bald ...' describes a rapid change between two different actions or states. It connects two main clauses or sentence parts.
Das Wetter war unbeständig: bald schien die Sonne, bald regnete es.
The weather was changeable: now the sun was shining, now it was raining.
immediate / same
'gleich' and 'bald' both talk about something that happens in the future. 'gleich' is very near: it often means in a few seconds or minutes. 'bald' is further away and less precise: it can mean later today, in a few days, or generally in the near future. They can be confused because both express 'not now, but soon'. If something happens almost immediately, 'gleich' is more natural. If the exact time is open, 'bald' fits better.

Der Mitarbeiter reist bald zu einer Schulung nach Hamburg.
The employee will soon travel to Hamburg for a training course.
Wir gehen gleich los, nur Mehmet sucht noch seinen Schlüssel.
We're leaving right away; Mehmet is just still looking for his key.