I was never good at Starcraft but I played it for years until I eventually stopped. There's plenty of tutorials and youtube videos on it and I am bad in explaining in general.
When you first click the icon and start the game, you will see a screen where there are multiple options. Then you click the Single Player if you want to play immediately. Then you could click the characters at the up side in order to do campaign mode which is basically just campaign and tutorial. If you want to play with an AI on a custom terrain then you could click on Play Custom. After you click play custom you will see a screen with multiple stuff. You could choose what map you want to play with by clicking files that have map names on them. Then you could choose the race you want to play as and the race of the AIs that you will be fighting against.
After you do all of that you will see the screen where you do the actual game play and the ways you play the game depend on what race you pick. Even through you could technically play without hotkeys it will be very hard to play without it. I personally think Terran is the easiest for early players as it is most "simplest" on how you build in general. But regardless of which race you pick, you have to click and drag to create a green square to select multiple small workers you see from the start. After you do that you could right click on the minerals to start mining and gather resources to do anything. The 3 icons that you see on right top are showing number of minerals and the gas you have. Blue is the minerals and the green stuff are the gas. But the 3rd icon from the left represents population which shows how much population that you could sustain and you could increase that number by building Supply Depots if you are Terran or by building Pylons if you are Protoss(aliens who aren't insects). But if you are the Zerg(insects), you need to build units called Overlords if you want to increase population. There's hotkey for building every building and as it's impossible to size up and down your view, you have to move your perspective through hotkeys and by moving a mouse to the edge. You could send units to see through the fog of war that is represented through darkness and it's one of important factors. But if you are fighting against a computer, computer could know where you are regardless if they sent a scout tPost too long. Click here to view the full text.