Discord.Net/docs/guides/other_libs/samples/ConfiguringSerilog.cs

using Discord;
using Serilog;
using Serilog.Events;

public class Program
{
    static void Main(string[] args) => new Program().MainAsync().GetAwaiter().GetResult();

    public async Task MainAsync()
    {
        Log.Logger = new LoggerConfiguration()
            .MinimumLevel.Verbose()
            .Enrich.FromLogContext()
            .WriteTo.Console()
            .CreateLogger();

        _client = new DiscordSocketClient();

        _client.Log += LogAsync;

        //  You can assign your bot token to a string, and pass that in to connect.
        //  This is, however, insecure, particularly if you plan to have your code hosted in a public repository.
        var token = "token";

        // Some alternative options would be to keep your token in an Environment Variable or a standalone file.
        // var token = Environment.GetEnvironmentVariable("NameOfYourEnvironmentVariable");
        // var token = File.ReadAllText("token.txt");
        // var token = JsonConvert.DeserializeObject<AConfigurationClass>(File.ReadAllText("config.json")).Token;

        await _client.LoginAsync(TokenType.Bot, token);
        await _client.StartAsync();

        // Block this task until the program is closed.
        await Task.Delay(Timeout.Infinite);
    }
}