Hi ,sir i m manoj kumar ,I am doning diploma in computer hardware and networking that was,duration of 6 months, plz tell me what i do futher

Its good, you get Certification in Networking, CCNA which is accepted by may companies for giving a job offer. And if your further interested you can do CCNP, CCNS, CCIE which are more advanced certifications in networking for which companies offer high paying jobs.