Here are some of the things Sibes have learned and enjoyed in the past! It's by no means a complete list and there are more detailed descriptions, with photos, of how to start training each command in almost every modern dog training book. You can also enrol in a puppy or intermediate training course to learn similar commands.
Have fun!

Sit
Cue: Say 'Sit'
Action: Move hand upwards, palm up.
Bonus marks: Hold the sit for 60 seconds, 'away' sit (where the dog is not near you)

Start by holding a small piece of food in front of the dog's nose and slowly raise it upwards, saying 'Sit'. Guide the treat backwards over the dogs head keeping it close to their nose. If the dog stands or backs up, start again. As soon as the dog begins to sit, say 'Sit'. When the dog has sat, reward them with the treat.

Come (Recall)
Cue: Say 'Come'
Action: Throw arms wide out to the side at full reach.
Bonus marks: Recall while there are distractions like new dogs or food around!

Use an elicitor such as a high pitched whistle, an inviting sound such as clapping, or a food treat or toy waved in the air to get the dog's attention and invite them to come to you. Praise every step they take in your direction with 'good dog', but avoid repeating 'come' too often. As soon as the dog reaches you give them a food treat and say 'good come', then let them go and play again, or start another exercise. Avoid waving food or toys at them too often as this is a blatant bribe and while they are good at getting a dog's attention, the dog won't learn much from a bribe.

Down / Flat / Drop
Cue: Say 'Down'
Action: Sweel arm downwards, holding palm down.
Bonus marks: Hold the down for 60 seconds, 'away' down (where the dog is not near you)

Start with the dog in a sitting position then hold a small piece of food in front of the dogs nose and lower it in a straight line to the ground just in front of the dog's paws. If the dog stands up, start again. As soon as the dog begins to lower their chest to the ground, say 'Down'. When the dog's chest reaches the ground, reward them with the treat.

Stay
Cue: Say 'Stay'
Action: Hand held palm outward in a 'Stop' signal.
Bonus marks: Hold the stay for several minutes, including when there are distractions around and when you are no longer visible. Walk around the dog in a circle while they hold the stay.

Start with the dog in any position (in fact randomise the starting positions so the dog doesn't become conditioned to say only staying while sitting) and stand in front of them, hold out your hand in a 'Stop' signal and say 'Stay'. Take half a step backward with one foot only, leaving the other foot in place. Hold this position for a few seconds then return to standing feet together in front of the dog. Say 'good stay' and reward with a food treat. After a day or two of practice at this, move up to taking one full step backwards. Practice this before moving two steps away, and so on, until the distance is as large as you like. If the dog moves, say 'too bad' and change training exercises for a while, don't give the dog any treat. When you start training 'stay' again, start with a smaller distance and increase the distance more slowly this time.

Cue: Say 'Shake' or 'High Five'
Action: Hold hand out palm up in front of the dog's paw.
Bonus marks: Change the cue to 'Left' or 'Right' for left and right paw shakes. Hold out two hands and have the dog balance so they can place both paws in your hands.

Most dogs will automatically paw at any hand you put in front of them. If they don't wave your hand about. Ignore the dog if they try mouthing your hand, and wait until they paw at it. Say 'good shake' and reward with a food treat.

Speak
Cue: Say 'Speak'
Action: Open and close our hand like you were operating a sock puppet mouth. Alternatively use the same action as if you were flicking water off your fingers at the dog.
Bonus marks: Differentiate between whining, howling and barking. Speak continuously for as long as you give the physical action cue.

This is best trained using opportunity training. Find something that makes your dog bark. As soon as they do, be ready with a food treat and say 'Speak' and reward with a food treat. Most dogs will bark when they are excited, or when strange dogs or people are around, or they are frustrated that they can't work out how to get the treat in your hand.