This is a really small and useful tool that will allow you to welcome back players and/or remind them of things as soon as they join the game. All you have to do to make this is do this command, " scoreboard objectives add Wb stat.leaveGame " and Wb could be whatever you want to make it then make a clock that runs this command, " testfor @p[score_Wb_min=1] " Wb beaing the objective name that you made for the first command. Then with a comparator coming out of the command block you just made have your /say or /tellraw or /tell or whatever command you want telling the person whatever or even giving them things. There are soo many things you can do. I did, " say Welcome Back @p " and then after you have that command ran add a repeater going into another command block that will run, " scoreboard players set @a Wb 0 " Wb being the scoreboard objective you had set the first command. You must run the last command or it will not work!