In Clash of Clans I have a few tactics I always use defensively and offensively.
My village is quite good defensively, it looks like this:
At the moment I like to attack with 60 archers, 60 barbarians and 1 dragon, I do have minions but I find them useless. The most successful attack I do is 3 dragons, 40 archers and 40 barbarians, just this takes ages to train and costs a lot of elixir to train.
The most important building is your Town Hall, so I have put it in the centre with a wall around it. Then I have placed defences that cause splash damage near the Town Hall (this is mortars and wizard towers). I also have a hidden Tesla and a cannon nearby. The other 4 cannons are in the outer ring along with archer towers. I have placed less important buildings like army camps, barracks, builder’s huts, etc in the furthest corners as this will slow down raiders.
Barbarians are the cheapest troops and they are great for distracting defences, also they are good in big groups.
Archers are good for long-range attacks and are useful for getting just outside of defences’ ranges. Sadly they are weak.
Goblins are great for taking loot but are quite weak.
Giants are good for taking a lot of damage but don’t do much damage and take up 5 housing space.
Wall Breakers are good for destroying walls but die in the process.
Balloons are good for destroying defences but can be killed easily with air defences.
Wizards are like archers but they take up 4 housing space.
Healers heal other ground troops when they are damaged.
At the moment dragons are my favourite troops as they are the best I have, they are great for destroying buildings quickly.
Pekkas are amazing at destroying buildings but are expensive and take ages to train.
Personally, I don’t like minions because they die quite quickly.
I have never had Hog Riders but they seem to be very good as walls don’t affect them.
I have seen a video with an attack with 30 valkyries and they are really good.
I have seen a video with golems as well and they survive for ages, the only problem is their damage per second is only a bit better than balloons.