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This question already has an answer here:

Is there a simple way to add symbols (circles, triangles etc) to the end of a line in QGIS?

marked as duplicate by underdark qgis Feb 24 '18 at 20:14

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If you need it only for display:

(1) Open Layer Properties | Style

(2) Click on green + button two times. Change each Symbol layer type to Marker line and check on first vertex only and on last vertex only.

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(3) Default markers would be circles. To change them to triangles, scroll this window a little down to icon list and select your preferred one.

enter image description here

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