der Wegweiser
signpost
A sign that indicates the direction to a specific place.
An der Kreuzung stand ein Wegweiser, der nach links zum Bahnhof zeigte.
At the intersection there was a signpost pointing left toward the train station.

signpost / guide
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signpost
A sign that indicates the direction to a specific place.
An der Kreuzung stand ein Wegweiser, der nach links zum Bahnhof zeigte.
At the intersection there was a signpost pointing left toward the train station.

The word consists of 'der Weg' (way/path) and 'der Weiser' (pointer/guide). A 'Weiser' is someone or something that 'weist' (points/shows). So a Wegweiser is literally something that shows the way. This applies both to the sign and to the figurative meaning.
Folgen Sie einfach den Wegweisern zum Gipfel.
Just follow the signposts to the summit.
You can recognize the literal meaning, a sign, from context words like 'Kreuzung' (intersection), 'Straße' (street/road), 'Richtung' (direction), or 'folgen' (to follow). The figurative meaning, guidance, is used in connection with abstract topics such as 'Leben' (life), 'Karriere' (career), or 'Entscheidung' (decision).
An der nächsten Gabelung steht ein Wegweiser zum See.
At the next fork there is a signpost to the lake.
In the literal meaning, 'Wegweiser' (signpost) often appears with verbs of movement or position. Typical phrases are 'einem Wegweiser folgen' (to follow a signpost), 'ein Wegweiser zeigt (nach links/rechts)' (a signpost points left/right), or 'ein Wegweiser steht an der Kreuzung' (a signpost stands at the intersection).
Der Wegweiser zeigte direkt zum Eingang des Nationalparks.
The signpost pointed directly to the entrance of the national park.
When 'Wegweiser' (guide) is used figuratively, it often refers to a person, a book, or a piece of advice. Common phrases are 'als Wegweiser dienen' (to serve as a guide) or 'ein wichtiger Wegweiser für jemanden sein' (to be an important guide for someone).
Die Ratschläge meiner Mentorin dienten mir als Wegweiser.
My mentor's advice served as a guide for me.
sign / shield
'das Schild' and 'der Wegweiser' can both be a board or sign with information. But 'Schild' is more general: it can warn, prohibit something, inform, or show a name. 'Wegweiser' is more specific and points in the direction of a place. Learners may confuse the words because a Wegweiser is usually also a Schild. As a practical rule: when it is about direction and orientation, 'Wegweiser' fits. If it only shows information or a rule, 'Schild' is more natural.

Im Wald folgen wir dem Wegweiser zum See.
In the forest, we follow the signpost to the lake.
Am Eingang hängt ein Schild mit den Öffnungszeiten.
There is a sign with the opening hours hanging at the entrance.