How to understand Go language operation Redis in one article

go get -u /go-redis/redis/v8

package main

import (
	"context"
	"fmt"
	"/go-redis/redis/v8"
)

// Define a global variablevar redisdb *
var ctx = ()

func initRedis()(err error){
	redisdb = (&{
		Addr: "127.0.0.1:6379",  //Specify		Password: "",
		DB:0,		// There are 16 libraries in total, just specify one of them	})
	_,err = (ctx).Result()
	return
}

func main() {
	err := initRedis()
	if err != nil {
		("connect redis failed! err : %v\n",err)
		return
	}
	("Redis connection succeeded!")
}

redisdb = (&{
		Addr: "127.0.0.1:6379",  //Specify		Password: "",
		DB:0,		// There are 16 libraries in total, just specify one of them
		//Connection pool capacity and number of idle connections		PoolSize:     15, // The maximum number of socket connections in the connection pool is 4 times the number of CPUs, 4 *		MinIdleConns: 10, //Create a specified number of Idle connections during the startup phase, and maintain the idle state for a long time at least the specified number;.
		//time out		DialTimeout:  5 * , //Connection establishment timeout, default is 5 seconds.		ReadTimeout:  3 * , //Read timeout, default 3 seconds, -1 means cancel read timeout		WriteTimeout: 3 * , //Write timeout, default is equal to read timeout		PoolTimeout:  4 * , //When all connections are busy, the maximum waiting time for the client to wait for available connections is default to read timeout +1 second.
		//Idle connection check includes IdleTimeout, MaxConnAge		IdleCheckFrequency: 60 * , //The period of idle connection checking is 1 minute by default. -1 means no periodic checking is performed, and only idle connections are processed when the client obtains the connection.		IdleTimeout:        5 * ,  //Idle timeout, default 5 minutes, -1 means canceling the idle timeout check		MaxConnAge:         0 * ,  //The duration of the connection is counted from creation. If the connection exceeds the specified duration, the default is 0, which means that the connection with a longer survival time is not closed.
		//Retry policy when command execution fails		MaxRetries:      0,                      // How many times can I try again when the command fails? The default is 0, that is, no retry		MinRetryBackoff: 8 * ,   //The lower limit of the retry interval time is calculated each time, the default is 8 milliseconds, -1 means canceling the interval		MaxRetryBackoff: 512 * , //The upper limit of the retry interval time is calculated each time, the default is 512 milliseconds, -1 means canceling the interval
		//Customize connection functions		Dialer: func(ctx , network, addr string) (, error) {
			netDialer := &{
				Timeout:   5 * ,
				KeepAlive: 5 * ,
			}
			return ("tcp", "127.0.0.1:6379")
		},

		//Hook function		OnConnect: func(ctx , conn *) error { //This hook function will be called only if the client needs to obtain a connection from the connection pool when executing the command.			("conn=%v\n", conn)
			return nil
		},
	})