What a negotiable instrument is under the Negotiable Instruments Act, 1881, the three named instruments, the parties to a cheque, crossing and endorsement, and how cheque truncation (CTS) clears a cheque without moving the paper.
Reading the 8 sections above, the worked examples and the practice set is free — the whole knowledge base is on the free plan, along with flashcards, private notes and Ask Onely.