How to write a client server application?

Question

Web development

It is necessary to develop an economic game. The essence of the game in brief is as follows:
There is a server program with SQLite through which you can create commands (drive in team names, etc.), and there are client programs in which players perform various actions (purchase, sale, etc.)

I plan to do so. Each action of the client will be transferred to the server, and he, in turn, will enter them into the database. But I don't know how to send them to the server. For example, using a socket, transmit a string, and process it on the server. How would you advise?

And what would you do in my place?