Answer for your first question is NO. SoloLearn does not charge for certificates . I have completed 4 courses (HTML, CSS, JS, Java) and downloaded the certificates after completing the whole course.
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It is good for beginners though it doesn’t cover topics completely to the core . IMHO Java is one of their best courses. Thanks for A2A. Honestly, I did not try the Java Course at Sololearn.
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