how to know image opened as svg

[snowforest]

Quote:Open the svg in Gimp.
Add an new layer Layer -> New Layer
Delete the original layer - click on it in the layers dialogue - Layer -> Delete layer
Merge all the paths in the paths dock - Make all the paths visible - right click for merge all visible paths.
Stroke the paths with suitable size Edit -> Stroke path
Turn the path visibility off.

Thanks for the effort to answer but I do not understand your answer. I am beginner, whose only purpose is to draw on lines on a svg drawing with black pencil.

Per the steps you wrote above:
I opened the svg in gimp
I added a new layer
I deleted the original layer. - Now I have nothing but an empty layer, with nothing on it. The original layer and all lines in it are gone.
Merge all the paths in Merge dock? What is merge dock? Where? I do not see a "merge dock" anywhere.... And what path? I deleted the only layer which had a path per your instruction in the previous step. I do not even get to making all paths visible because I do not even see where it it and I do not have a path. I am staring at a blank layer with nothing in it.