Dry as hell but spot on explanations. Some the greeks are meh... some are important, like delta and theta
If you own 100 shares of a stock, you can write calls against it, covered calls. Acts like a dividend, weekly or monthly/45 days out, buy more shares with the premium. Yes you stock can be called away, but also at a higher price than when you sold the call. Also you can roll the calls out in time and up in price. Try to always take in premium when if you do. Also you can set up your account for "last in, first out" for accounting. That way if you don't want you stock called away, buy 100 shares and let it get called away, to not trigger a taxable event on older large gain shares. If the stock is right at or above the strike at expiration, I usually roll stuff out the within the 5 days prior to option expiration.