Hello my friends, Why is it and how can I correct the fact that every time I try to create a line using the bezier it appears blank with no color at all. I haven't been able to draw a line or curve in red color. Thank you for your help

EDUARDO

Check your display mode. Outline mode? Should be Normal mode. 

View>Display Mode

Thank you it is in "normal" mode but I still have the same problem.

Have a screenshot of your bottom status bar? 

This is a complete screen shot

you can see a dotted rectangle which should have a diaginal red line but no, nothing appears

Opacity is 0, change to 100. Also disable fill if just want a line.

Good morning, sorry for late reply. Check please the attached screen-print. The problem persists. Perhaps I didn't make the correct correction. I appreciate your help. 

Do you mean these two should be 0 or shouldn't. 

Do you mean these two should be 0 or shouldn't. 

100

I'm extremely sorry to bother you but still no luck. Perhaps uninstalling and reinstalling the software might help?. 

I'd try resetting the preferences: https://inkscape.org/forums/questions/getting-back-to-square-one-and-starting-over-its-easy/

I couldn't find RESET PREFRENCES in my Inkscape version which is 0.92. Perhaps I have to install a neweer version?  

Absolutely update. It will look different, but we can make it look like .92

I decided to install the 1.2 version and I finally solved the problem.

One last issue, how can I turn black to white background? I couldn't find how to do it. 

Thanks.

Please update to 1.4.2 instead of 1.2. You will have much better tools and get better support.