Soon, the pet will come to learn what behaviours lead to clicking and a treat and repeat them. If you cannot spend too much on treats, you can also use home-cooked treats or praise to teach your pet. Investing in a good chew toy is another idea.
Sometimes, local communities or charities have pet training sessions you can make use of. This arrangement can be healthy and helpful if your pet is comfortable enough to socialise and play around with others.
Exercising will not solve all the behavioural problems that your pet is facing, but they can be managed this way.
No matter what, you should not avoid behaviour training due to the cost. After enough discussion, you can figure something out with pet training services in Basaveshwara Nagar. If your pet is too aggressive or destructive, you must find appropriate services for their good.