Following are some useful links

• CBDT: https://www.incometaxindiaefiling.gov.in/ 
• CBIC: https://www.cbic.gov.in/
• GST: https://www.gst.gov.in/ 
• RBI: https://www.rbi.org.in/
• MCA: http://www.mca.gov.in/ 
• NSDL: https://nsdl.co.in/ 
• TRACES: https://contents.tdscpc.gov.in/ 
• Trade Mark: https://ipindiaonline.gov.in/ 
• FSSAI: https://www.fssai.gov.in/ 
• DGFT: https://www.dgft.gov.in/ 
• ICEGATE: https://www.icegate.gov.in/ 
• EPFO: https://www.epfindia.gov.in/ 
• UDYAM: https://udyamregistration.gov.in/ 
• Shram Suvidha: https://shramsuvidha.gov.in/ 
• FIEO: https://www.fieo.org/ 
• ICAI: https://www.icai.org/
• ICSI: https://www.icsi.edu/
• ICMAI: https://icmai.in/