B.Com Scope

Diploma in digital marketing
Tally
Excel
Business accounting and taxation. These are some short-term courses you can do after your B.Com.

Yes as for B.Ed. You need a graduation degree you can easily get admission after doing B.Com.

Along with your B.Com, you can do internships, learn new skills, join new clubs, all these will help you in weighing your resume. Which will help you in getting a job fastly.

Yes, As advertising is one of the modes of Marketing
you can pursue your career in marketing by doing MBA or Diploma in advertising.

It depends upon you. If you don't have any pressure of earning you can go for higher studies otherwise you can go for a job. Along with the job you can learn through various correspondence courses.

You can go for both. While doing M.Com on regular basis. You can do a Diploma on distance basis. You will get do degree/certificate at same time. Government validates getting 2 degrees at same time one as regular one as distance.

You should either go for MBA. Or various institutions provide PG Diploma in taxation you can learn from there.

Yes, you can. There's no restriction on doing so.

CA somehow make your B.Com degree valueless. But doing B.Com will help you in covering more fields which will help you in the future after becoming CA.

It depends upon you if you want jobs you can go for jobs. If you want to do further study you can go for M.Com MBA or professional course like CA CMA CS and many more.