Good article here : https://www.moneyland.ch/en/stock-market-profits-tax-free
I would directly read the circulaire from the ESTV/AFC. It is a bit longer but you have the official informations (which are the same of this article but longer with references to federal court judgements etc.).
Edit : Circulaire No 36 (apparently it is only 8 pages, I thought it was longer). According to the file name, looks like I dowlnoaded it 3 times 
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Bought 50,000 CHF worth of stock by mistake which I sold immediately afterwards with a total loss of 35 CHF.
I wanted to sell 50,000 originally, accidentally bought 50.000 and ended up selling both the original and accidentally bough 50,000 CHF for a total sale of 100,000 CHF.
Do you think the tax office will realize that I made a mistake and not designate me as a professional investor despite not holding for 6 months ?
No personal direct experience like that, but based on other experience made (let’s say “worse”, selling for a profit after a month etc) I think that they definitely won’t classify you pro due to a trade like that.
I find there is generally way too much nervosity by “simple investors” on this forum about being classified a pro investor. If you have a full-time day-job you’re 99% safe for a start IMO, then u would need huge profits, fancy stuff day trading options, etc.
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Yes, exactly and more over seems like we do not know what the impact would be in case tax authorities qualify us to professional investor bucket Anyone knows what are the tax rates for capital gains for professional investors then? Is it flat rate or progressive?
Many thanks!
It’s treated as income.
It’s self employment income - you pay your personal income tax in full (progressve rate) and on top of it, 2x AHV (flat 10.25%), as the legal fiction is that you’re your own employer.