What evidence can I present in court for my small claims case?

In traditional courts, there is a certain restriction on what constitutes "admissible evidence". Any document, testimony, or tangible evidence are generally thought to be acceptable evidence. However, Online Dispute Resolution (ODR) platforms operate on the principle of "relaxed rules of evidence," which considers practically anything admissible upfront. However, all this is then subject to thorough examination by the arbitrator, who will determine what evidence is acceptable to contribute to the claim of either party.