You need to manage your money while thinking of the future. This means saving up your money in savings accounts which accumulate interest, instead of spending it all on frivolous purchases leaving nothing left over for the essentials. For example, lets say you earn $25.00 a day. You could wait for 60 days and buy a fancy gaming console for $1500, or you could save up the money in a savings account, and buy a used car in less than a year. Obviously the first option provides instant gratification, but is useless in the long term. The second option is more time consuming, but very rewarding in the long term - you have a means of transporting yourself, several other people, and a reasonably large number of items, for large distances. Which do you choose?

That's what I mean when I say, spend wisely. It's common sense.

*In addition, some holidays like Father’s Day, Mother’s Day, Valentines Day, etc, have special sales: See https://www.calendar-canada.ca/shopping-calendar, for more info 

With a very few exceptions, you can build a lot more items with the same amount of money than you can buy at a store. That's because there is an additional cost to assemble the items, plus the raw materials cost. It's common sense, people.

This is a bit of an extreme example, but take a look at ethernet cables. My networking teacher told me that you can buy a massive roll of unterminated cable, which would be much cheaper than a pre-made ethernet cable. The catch: You have to terminate the cable ends yourself.

Project Reject's Upcycling Tips 

Branded items usually aren't so much better than their non-branded or not so well known equivalents, and the reason they're so expensive is because some people buy them and show them off, thinking they're better than everyone else, but nope, all they're doing is showing the world how stupid they are - they got cheated out of their money.

Exceptions go for expensive items that need to be reliable, like cars, power tools, appliances, electronics, etc. You need an item that will last long, and is worth the cost (which is usually very high) and so, getting a well known brand is usually best.

Though as a student under the age of 18, you're very unlikely to accumulate debt, as you won't have credit card bills or mortgage bills (you may have to pay off installments for a car if you're over 16 and bought a car), but still, it's a good idea to keep this good habit for when you get older. 

Just like money in savings accounts accumulates interest (which is good),  if you fail to pay loans and debt in time, or even pay normally, in installments, they accumulate interest over time, which is bad, because you end up paying more than the actual original cost of the debt/loan. The interest rates for loans and debt are usually much higher than in savings accounts. The latter only goes up to 2.5% at an absolute maximum, usually under 1%, while the former can charge interest rates as high as 15% or even higher! So make sure to pay off debts quickly (to avoid getting bankrupted), and don't accumulate debt. 

The previous point brings me to