1-create single vertex by hitting shift+a and choose single vert from mesh section

2- you need two point one for start and another for the end

you have the first one press e to extrude one more and place it to the location you want

3- now select all vertices and subdivide them and pull the middle vertex down to you liking


4- now again sub div more until you have enough point


5- now you need a pin group add start and the end point to a pin group

6- add cloth from physics panel and add the pin group there


7- now we need a mesh for this easiest way to add mesh to this is by adding skin modifier













8- in edit mode select all the vertex by a and scale them down by ctrl+ a also turn on smooth shading