To apply for student visa, you must prove you (& your parents) have sufficient funds for all school + living expenses + return transportation to your country of citizenship. Amounts vary depending on university & country. It is NOT sufficient to show a cash balance in a bank, especially if there is any sudden influx of funds (that's considered a major sign of fraud, and will likely get your visa application denied). And you will be required to transfer that money to a bank account in the foreign country (after direct payment of deposits, etc. to the school). Parents' annual income - earnings + investment income, assets, etc. - must be sufficient to continue paying your bills until graduation, plus return transportation to your own country.
For minimum amounts required, expect you'll likely need to prove: USD50,000/year for 4 years (for lower-cost schools in lower-cost areas of US). UK: GBP30,000-40,000/yr. Canada: CAD40,000/yr. Australia: AUD60,000-75,000/yr. That's without working while you are a student! All countries severely restrict or outright prohibit any work by foreign students. And even where limited work is allowed, the majority of foreign students never find any job. It's not enough money (after work expenses like transportation, uniforms or proper attire, etc, and perhaps taxes) to cover much of your expenses anyway, even if you did get lucky.