Dear Kiran,it totally depends on which course you are looking for.There are many certified professional courses on offer and due to this lockdown,many courses are being offered for free.You dont need to pay anything for it and after completion of these courses you will also receive a certificate which you can show in your RESUME.

There are many platforms which offer many certified professional courses like UDEMY,COURSERA,GREAT LEARNING and many more.These courses are being taught by the experts so you can expect a good knowledge and it will help a lot in increasing your skills.

ALL THE VERY BEST.