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Every resource founders actually use, in one library.

The essays, videos, podcasts, books and tools behind every answer across eChai's hubs, from starting up to go-to-market, D2C, founder money and AI, each with a note on why it is here.

What founders use most, ranked by how many answers lean on it.

  1. Explains the underlying rule behind the up to 7 working days figure, plus the deemed approval backstop most founders don't know... TaxGuru Article · D2C Time limit increased for grant of GST registration from 3 to 7 working days TaxGuru
  2. Summarizes the actual GSTN advisory that decides whether you get an easy Aadhaar OTP or a mandatory Suvidha Kendra visit, state... TeamLease RegTech Report · D2C GSTN Advisory for Biometric-Based Aadhaar Authentication and Document Verification (Bihar, Delhi, Karnataka, Punjab) TeamLease RegTech
  3. Answers the exact timeline question with the working day nuance, weekends and holidays don't count, that catches first time... IndiaFilings Article · D2C In How Many Days Is GST Registration Approved in India? IndiaFilings
  4. ClearTax is one of the most used filing platforms in India and this guide is written specifically around the newer fast track... ClearTax Article · D2C GST Registration in 3 Days: Step by Step Process Guide ClearTax
  5. An interactive version of the checklist that generates the exact document list for your specific business constitution instead... TaxBizMantra Tool · D2C Free GST Registration Document Checklist Tool TaxBizMantra
  6. If you plan to use Amazon FBA or Flipkart FBF warehouses, your GST registration doesn't stop at one state, this explains the... Virtual Office Kochi Article · D2C Multi-State GST for Amazon & Flipkart Sellers: The 2026 Guide Virtual Office Kochi
  7. Video · D2C New GST Registration Process from November 2025, Get GST Number in Minutes YouTube
  8. Video · D2C GST New Simplified Registration Process: Step by Step Detailed Guide (2025) YouTube
  9. This is the actual GSTN advisory behind the 30-day rule, straight from the regulator rather than a paraphrase, so you know... GSTN (Goods and Services Tax Network) Report · D2C Advisory on Bank Account Validation GSTN (Goods and Services Tax Network)
  10. The official step-by-step manual for the exact screen you will be on when you add your bank account, so you are not guessing... GST Portal (tutorial.gst.gov.in) Article · D2C Manual: Amendment of Non-Core Fields (Bank Account Validation) GST Portal (tutorial.gst.gov.in)
  11. Cuts through the portal's cryptic status labels so you actually know whether you're done or still exposed to suspension after... ClearTax Article · D2C All About Bank Validation Status on GST Portal ClearTax
  12. The clearest field-by-field breakdown of what Rule 46 actually requires, with the HSN-digit rule spelled out by turnover slab... Tally Solutions Article · D2C GST Invoice: Format, Types, Mandatory Fields & Examples Tally Solutions
  13. A single glance-able calendar to put your GSTR-1/GSTR-3B dates straight into your own calendar instead of hunting through... ClearTax Tool · D2C GST Calendar 2026-27: GST Due Dates, Filing Deadlines and Compliance ClearTax
  14. Video · D2C GST Returns Filing 2026: How to file GST Returns, GSTR-1, IMS & GSTR-3B YouTube
  15. The rare resource that sequences the tasks in order instead of listing rules alphabetically, so you know what to do this week... CA in Bangalore Template · D2C GST Compliance Guide for First-Time GST Registrants: Month-by-Month Checklist CA in Bangalore
  16. If you want compliant invoices and eventual e-filing from one tool rather than stitching together a billing app and a separate... Zoho Tool · D2C Zoho Books: GST Billing Software built for Indian SMEs Zoho
  17. Worth a skim even at invoice-zero, since a DPIIT-recognized D2C startup may qualify for GST and income-tax carve-outs that... Startup India / DPIIT Report · D2C Tax Playbook for Startup Ecosystem (May 2026) Startup India / DPIIT
  18. The clean global baseline for what belongs on any invoice, useful to sanity-check your GST-specific template is not missing... Xero Article · D2C What to include on an invoice: a complete guide for small businesses Xero
  19. If your D2C brand plans to sell outside India too, this is the cleanest mental model for treating tax registration as a... Stripe Template · D2C Getting Started: Sales Tax Compliance Checklist Stripe
  20. If you bill through Shopify, this is the primary doc for where your GSTIN and tax settings actually plug into the platform,... Shopify Article · D2C Shopify Help Center: Taxes Shopify
  21. A ready-made checklist format, not just an article to read, that you can literally tick through while setting up your invoicing... A2X Template · D2C The ESSENTIAL Ecommerce Bookkeeping Checklist A2X
  22. Zooms out from the single invoice to the bookkeeping system it feeds into, so your first invoice lands in a set of books that... Shopify Article · D2C Ecommerce Bookkeeping 101 for Small Business: A Step-by-Step Guide Shopify
  23. This is Meta's own plain language explainer of the auction, the primary source for the three inputs your ad is actually judged... Meta for Business Article · D2C Facebook Ad Auctions Explained Meta for Business
  24. Once you know the auction has a bid component, this is the clearest breakdown of which bid strategy actually controls what,... Jon Loomer Digital Article · D2C Facebook Ads Bid Strategies: Lowest Cost, Cost Cap, Bid Cap Jon Loomer

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