You've found it...
There are two ways of buying a home - auction or private sale.
Offers to purchase may be made in two ways - unconditional (commitment to buy the house as listed at the price agreed) and conditional (you will buy if certain conditions are met, e.g. a soil test of the property).
At auction, make sure you keep your financial limit in mind. Remember, once you have made a bid, it cannot be withdrawn.