at personal level, you do not need to declare the shares you hold in other companies and even if the share value has gone up, you are not subject to tax.

Declare your salary income shown on your EA form under pendapatan berkanun pengajian (if you have more than one EA form, then combine the total)

For all sorts of commission as shown in your CP58, declare it under pendapatan berkanun faedah, diskaun..... etc

You buy in bulk and constantly sell it online. This will satisfy badges of trade principle as you are doing it to make profit .. You may argue you are doing it as a hobby but this is not a valid reason and you will never win.

You need to declare this income as your business income. You will need to prepare a proper set of account and keep all the receipts and expenses that you incurred for this business and make proper tax filing together with your personal income tax either Form BE or Form B.

Whether you will be subject to tax or not , that will depends whether you have any other source(s) income and how much in total.

Hi.. I understand it is just to earn some allowances.. But still it is a business to you and you should declare the money you made. If your margin is super high, then you probably will feel the impact of the additional tax you have to pay, otherwise it will be just minimal impact.

Technically yes.. Any profit or loss you made from your business should declare it and whether you need to pay tax is another question ...