You asked

My toddler is constantly testing the limits. What can I do?

Toddlers often insist on doing the very things that you don't want them to. As an alternative to telling them 'no' continuously, work out ways of distracting them with alternative tasks and activities to keep them occupied.

It is a good idea to allow them freedom to move around and interact with objects, by creating a couple of 'safe zones' around the house. Rooms or outdoor areas can be cleared of dangerous objects, or things that can break. In rooms, sharp corners should be padded and furniture like coffee tables should be removed.  Put pillows and toys there for them to play with.

Toddlers are also fascinated by water and can be kept occupied by a bowl of soapy water and a few plastic implements.

You may also have noticed that your child is becoming more aggressive – with you and with others. Aggression displayed by toddlers from about 14 months is usually as a result of frustration, not malice. They have no empathy about hitting playmates, so it is best to be nearby to intervene when they play as a group. Toddlers will misbehave to get attention. Corporal punishment won't work, since they will not understand why they are being punished. Do not overreact to negative toddler behaviour and use praise when they are well behaved. In the mean time, realise that your toddlers testing of the limits is just another way he or she is learning about the world around them.

More questions

A parent wants their child to have everything because they love them. But showing your love without spoiling your child rotten is difficult at best.
Most people believe that sugar is the main cause of hyperactivity in children
Most parents will resort to using threats to discipline their children. This tactic is not effective and does not each your child anything.
A two year old has a limited vocabulary and too often, the word “no” is one of their favourite words.
Dealing with your toddler's back chat
Waking up in the middle of the night is normal for toddlers and it could indicate that their afternoon nap is too long.
Disciplining a toddler does not involve punishment, but teaching them right from wrong.
If you begin teaching your child rules and acceptable behaviour early on, you’ll have a much easier time later.
Tantrums are a normal part of a toddler's development and are a means of venting their frustration and anger.