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I see two problems in your approach: The file you load seems to be a txt file, not a csv file. You should save your text file as csv. You say you "added delimited text layer" to QGIS. CSV files cann …

You can dynamically create a centerline (defined here: a line passing through the centroid of the polygon shape) using QGIS expressions. You might use this expression for visualization purpose only, t …

Use Menu Processing > Toolbox > Split Vector Layers tool and use the X-field (country) in the first round. Then again split the resulting US and Canada layers again, this time using the Y-field (state …

Drag and drop your geopackage file to the QGIS window and a dialog will allow you the select what kind of data you want to load as layer. As an option, you could just select everything. Option 2: Ope …

Use Menu Processing > Toolbox > Geometry by expression (see documentation) with this expression: collect_geometries( array_foreach( generate_series (1, "Number"), make_point ($y,$ …

Another option would be to integrate your two models in another model. QGIS documentation says: A model behaves like any other algorithm, which means that you can add a model that you have already cr …

You can't save data inside of the QGIS project file. Using QGIS, project and data are always stored separately. What you can do, however, is to save the project plus data file to the same Geopackage f …

Save your project as QGIS files (.qgs), not the default (zipped) .qgz file - or unzip the .qgz project file. Then you're able to open the project in a text editor in a human-readable format. There, yo …

You can either shift the line automatically or manually: You can use QGIS expressions with Geometry generator or Geometry by expression and the function translate( $geometry, dx, dy) to offset the li …

Use Select by expression with this expression and change the size of the buffer (end of line 2 - here: 0.0001) depending on the size of your polygons/the CRS you use (in most cases, it should work wit …

On the line layer, use this expression to identify the id of the point that lies on (or nearest to) the line: overlay_nearest( 'point_layer', $id)[0]. Instead of point_layer, use the name of your poi …

Based on spatial relationship To do it based on spatial relationship, you can use one of the overlay functions, e.g. using one of the following expressions. The first two only work if the two lines ar …

There seem to be two problems: layer CRS and file format. To solve both, proceed as follows: Layer CRS Your screenshot shows that your data is in a geographic CRS (EPSG:4326). When I download the data …

Solution You don't even need to rename the clipped line layer to integrate both of your models in a single one. In the answer you linked to, the problem was with input layers. Here, we deal with layer …

Advice Your question seems quite basic, so I advice you to have a look at some tutorials (like Klas Karlsson's QGIS 3 for Absolute Beginners), books (like Kurt Menke's Discover QGIS 3.x) and the QGIS …