Explore · The library

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. 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
  2. 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
  3. 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)
  4. 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)
  5. 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
  6. 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
  7. 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
  8. 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
  9. 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
  10. 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
  11. 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
  12. Since creative wins the auction, this guide teaches you to actually use Meta's free public Ads Library to see what every... Foreplay Article · D2C Facebook Ads Library: The Definitive Guide Foreplay
  13. Meta does not charge GST on its invoice to Indian advertisers, so most founders underestimate the real cost of their ad spend... Legal Suvidha Article · D2C Facebook Ads TDS & Refund Rules 2026-27 Legal Suvidha
  14. Reports the removal of the 6 percent equalisation levy on foreign digital ad platforms from April 2025, a real change to the... Business Standard Report · D2C India to scrap 6% equalisation levy on digital ads, leading to revenue loss Business Standard
  15. An independent market data report on where Indian digital ad spend is actually going, useful for benchmarking whether your own... Sensor Tower Report · D2C India State of Digital Advertising 2025 Sensor Tower
  16. It is the exact screen by screen path Meta expects you to follow, useful for cross checking against whatever a paid tutorial... Meta Business Help Center Article · D2C Set up and install the Meta Pixel Meta Business Help Center
  17. Read this before touching any settings so you understand why CAPI exists, not just how to click through it. Meta Business Help Center Article · D2C About Conversions API Meta Business Help Center
  18. This is the actual settings page language you will see inside your own Shopify admin, so it removes guesswork about which... Shopify Help Center Article · D2C Facebook data sharing Shopify Help Center
  19. Running pixel and CAPI together without matching event_ids just means you're double counting, not building redundancy. This... Meta for Developers Article · D2C Handling Duplicate Pixel and Conversions API Events Meta for Developers
  20. If you're not on Shopify or want a CAPI setup independent of your platform's native app, this is the clearest independent... Jon Loomer Digital Article · D2C Set Up Meta Conversions API Gateway Using Stape Jon Loomer
  21. Turning on CAPI is step one. This is the step two guide for making sure the data you send is actually good enough for Meta to use. WeltPixel Article · D2C Meta Event Match Quality (EMQ): How to Improve Your Score WeltPixel
  22. Indian founders hit business verification friction Western guides never mention. This is written for exactly that gap, using... Interakt Article · D2C 10 Step Guide To Get Meta Business Verification [Without Website] Interakt
  23. A clear technical comparison from a Chennai built team that builds first party data tooling for a living, useful once you're... CustomerLabs Article · D2C Conversions API vs. Meta Pixel: What's Better for Tracking? CustomerLabs
  24. Most tracking guides ignore what stage a brand is at. This one is pegged to a specific, realistic Indian D2C spend level, so... Wittelsbach Report · D2C 10L/Month D2C Brand Meta Ads Playbook: From Survival to First Profitable Spend Wittelsbach

Show the next 24

The hubs

eChai Partner Brands The partnership →