How to determine your budget for investing in the stock market?

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When I started my journey on the stock market, I didn't know what the optimal amount would be for me to start buying the first shares. So I often bought too much and could not allocate funds to all the assets that I was interested in, as well as to other projects in other areas. Then I made a conclusion for myself that it is necessary to invest 10 percent of the profit, but then it turned out to be not enough, and when the shares grew, I earned too little. Therefore, I limited myself to only the most popular shares in which I invested most of the profit, and when they grew, I already had a solid amount