and also I'm still learning, hope to learn from the sifu here

So I've set aside a small amount of funds for trading, since the FD rate are pretty shitty now, so I was thinking why not invest in stock market since some of the stocks are at their all time low now due to certain factors like scandals & disasters. If stock price increase after the crisis then good la, better return than FD, if drop further, nvm then, will treat it as just bad luck, some unexpected expenses like expensive car repairs

and hold it until it rebound, hopefully.
Also about pennyshares, will a hit & run tactic sustainable for long term?
example I targeted a high vol pennyshare, then just let go when price increases just by 0.005, to make a tiny profit, and rinse & repeat
since it's pennyshare, it won't drop too much or too drastically, and if got burned, also won't be too hurtful... this tactic ok?

There are many ways to trade/invest.
My suggestion is not to follow the herd.
Under current market, find a good company with decent management which stock price has been battered/not appreciated in the current cycle and wait it out. 1-2 years horizon.
Avoid companies run by crooks or dubious characters.