Actually, it can help. It shows that you are willing to improve your skills and that you can self-study.
For me, it did help me to get my current job.
A course from a well-known company like Microsoft or a university degree is worth way more, though.
It won't give you a job, but it can help you get through your interviews.
Hello mate. Straight to your question, you can attach the sololearn certificate to your resume to outsource your skills when applying for job.
Moreover being a freelancer you can attach the certificate on your profile and even on your portfolio. Every certificate plays some role