Useful information and updates from the GST Portal/ Network (GSTN) on the functionalities and forms for filing under the GST laws:

Particulars
GST Portal Update dt. 29/03/2022: Eligible taxpayers who wish to avail the composition scheme for FY 2022-23 may opt in for composition before 31/03/2022, as the window to opt in has been enabled/ made available at GST Portal.
GST Portal Update dt. 23/02/2022Upcoming GSTR-1/ IFF enhancements & improvements (Phase II)
GST Portal Update 25/01/2022: GSTN issues Advisory with Examples about new functionality of interest calculator in GSTR-3B, which is live now on the GST Poral, to assist taxpayers in doing self-assessment, by providing system computed interest based on tax liability declared.
GST Portal Update 06/01/2022: The functionality of ‘Search HSN‘ has been revamped on the GST Portal. The upgraded version has been deployed and the taxpayers can now search the HSN code and the applicable Technical description through common parlance/ trade description of the goods/ services as they are known in the Trade, i.e. taxpayers can search HSN Code by providing description/ part of a description.
GST Portal Update dt. 04/01/2022: GST Advisory on Reporting of supplies by Ecommerce Operators and Restaurants in GSTR-3B, in respect of supplies of restaurant service through ecommerce operator, on which tax is to be paid by ecommerce operator w.e.f. 01/01/2022. Also refer CBIC GST Circular 167/23/2021 dt. 17/12/2021 for clarifications in this regard.
GST Portal Update dt. 03/01/2022: New functionality is deployed on GST Portal, to implement amendments in CGST Rule 59(6) w.e.f. 01/01/2022, vide Central Tax Notification 35/2021 dt. 24/09/2021, to restrict filing of GSTR-1 for subsequent months, where a monthly filer has not filed GSTR-3B for the preceding month. This new functionality will first confirm the filing of preceding GSTR-3B internally before permitting to file GSTR-1 for the subsequent month.
GST Portal Update dt. 01/01/2022: A useful compilation of common issues & errors reported on GST portal, in the matters relating to registration, returns, payments, e-way bills, appeals, etc.  along with suggested solutions for Taxpayers, which should be referred to before approaching the Help Desk.
CBIC Updates (GST)
GST Circulars, Notifications, Press Releases, Orders, etc. issued by the Central Board of Indirect Taxes & Customs (CBIC) in different years, along with Section-wise/ Rule-wise Text of GST Acts/ Rules:
CGST: CGST Act/ Definitions, CGST Rules, GST Forms
IGST: IGST Act/ Definitions, IGST Rules
UTGST: UTGST Act/ Definitions, UTGST Rules
CBIC Circulars (CGST/ IGST/ UTGST): 2021, 2020, 2019, 2018, 2017
CBIC GST Instructions: 2022, 2021, 2020, 2019, 2018, 2017
CBIC CGST Notifications: 2022, 2021, 2020, 2019, 2018, 2017
CBIC CGST Rate Notifications: 2021, 2020, 2019, 2018, 2017
CBIC IGST Notifications: 2022, 2021, 2020, 2019, 2018, 2017
CBIC IGST Rate Notifications: 2020, 2019, 2018, 2017
CBIC UT Tax/ UTGST Notifications: 2022, 2021, 2020, 2019, 2018, 2017
CBIC UT Tax/ UTGST Rate Notifications: 2020, 2019, 2018, 2017
CBIC Compensation Cess Notifications: 2022, 2021, 2020, 2019, 2018, 2017
CBIC Compensation Cess Rate Notifications: 2022, 2021, 2020, 2019, 2018, 2017
CBIC Orders (CGST/ IGST/ UTGST): 2020, 2019, 2018, 2017
CBIC Press Releases: 2020, 2019, 2018, 2017
GST Portal/ Network (GSTN) Updates
Note: For Official/ updated copy, please visit the CBIC website.