GST Website:
https://www.gst.gov.in/
CBIC Website:
https://www.cbic.gov.in/
GST Notifications:
http://cbic.gov.in/htdocs-cbec/gst/central-tax-notfns-2017
Income Tax Website:
https://incometaxindiaefiling.gov.in/
MCA Website:
https://www.mca.gov.in/
Maharashtra GST Website:
https://mahagst.gov.in/