... can you say more than the absolute bare minimum you have so far? It's impossible to come up with any decent questions without knowing anything.
edit: wait, is this it? https://fixparser.dev/what-is-fix
edit: wait, is this it? https://fixparser.dev/what-is-fix
Basically, the process involves connecting and handshaking through a series of messages, which results in an active FIX session. Once the session is established, you can send bidirectional messages, such as requesting a market data snapshot to receive prices, submitting a new order, or anything in between.