Is the certificate which I have earned here is valuable ?

Answer 1

Short answer: No.
Long answer: Not only are they very basic, but also it doesn't prove anything. Many people here (including me) have certificates, but can't code anything more than the basics of the language.
What matters THE MOST when applying for job, is your previous codes. The more advanced they are, the more chances you have to get it.
Also, it's not only about the syntax of a language, modules matter much more, because syntax can easily be understood in less than a week, but modules and experience take years to build.

Answer 2

The SoloLearn courses are very basic level, so they are not really a good indication of your skill and knowledge. They can set you on the right path to learn more from other sources, to share your learning process with the community and to learn from others who are in the same shoes as you.
Hence the certificate itself won't land you any job offers. It is just the baseline.

Answer 3

I think it is like motivation to finish the course :)
Dunno will you need it in real life or not, but I think not.