Here are the classes, structs, unions and interfaces with brief descriptions:

Ctelebot_animation	This object represents a video file
Ctelebot_audio	This object represents an audio file to be treated as music by the Telegram clients
Ctelebot_bot_command	This object represents a bot command
Ctelebot_callback_query	This object represents an incoming callback query from a callback button in an inline keyboard. If the button that originated the query was attached to a message sent by the bot, the field message will be present. If the button was attached to a message sent via the bot (in inline mode), the field inline_message_id will be present. Exactly one of the fields data or game_short_name will be present
Ctelebot_chat	This object represents a chat
Ctelebot_chat_member	This object contains information about one member of a chat
Ctelebot_chat_permissions	Describes actions that a non-administrator user is allowed to take in a chat
Ctelebot_chat_photo	This object represents a chat photo
Ctelebot_contact	This object represents a phone contact
Ctelebot_core_handler	This object represents a core telebot handler
Ctelebot_core_response	This object represents a telegram bot response
Ctelebot_dice	This object represents a dice with random value from 1 to 6
Ctelebot_document	This object represents a general file (as opposed to photos, voice messages and audio files)
Ctelebot_file	This object represents a file ready to be downloaded
Ctelebot_force_reply	Upon receiving a message with this object, Telegram clients will display a reply interface to the user (act as if the user has selected the bot's message and tapped ’Reply'). This can be extremely useful if you want to create user-friendly step-by-step interfaces without having to sacrifice privacy mode
Ctelebot_keyboard_button	This object represents one button of the reply keyboard. For simple text buttons String can be used instead of this object to specify text of the button. Optional fields request_contact, request_location, and request_poll are mutually exclusive
Ctelebot_keyboard_button_poll_type	This object represents type of a poll, which is allowed to be created and sent when the corresponding button is pressed
Ctelebot_location	This object represents a point on the map
Ctelebot_mask_position	This object describes the position on faces where a mask should be placed by default
Ctelebot_message	This object represents a message
Ctelebot_message_entity	This object represents one special entity in a text message. For example, hashtags, usernames, URLs, etc
Ctelebot_photo	This object represents one size of a photo or a file / sticker thumbnail
Ctelebot_poll	This object contains information about a poll
Ctelebot_poll_answer	This object represents an answer of a user in a non-anonymous poll
Ctelebot_poll_option	This object contains information about one answer option in a poll
Ctelebot_reply_keyboard_markup	This object represents a custom keyboard with reply options
Ctelebot_reply_keyboard_remove	Upon receiving a message with this object, Telegram clients will remove the current custom keyboard and display the default letter-keyboard. By default, custom keyboards are displayed until a new keyboard is sent by a bot. An exception is made for one-time keyboards that are hidden immediately after the user presses a button (see telebot_reply_keyboard_markup_t)
Ctelebot_response_paramters	Contains information about why a request was unsuccessful
Ctelebot_sticker	This object represents a sticker
Ctelebot_sticker_set	This object represents a sticker set
Ctelebot_update	This object represents an incoming update
Ctelebot_user	This object represents a Telegram user or bot
Ctelebot_user_profile_photos	This object represent a user's profile pictures
Ctelebot_venue	This object represents a venue
Ctelebot_video	This object represents a video file
Ctelebot_video_note	This object represents a video message (available in Telegram apps as of v.4.0)
Ctelebot_voice	This object represents a voice note
Ctelebot_webhook_info	Thi object represetns information about the current status of a webhook