If I own 100 shares of Company A. I can sell it anytime I wish right? How does one receive dividend from the company? Does it get deposited in my trading bank account?

Unless it is restricted stock you can sell anytime. Dividends are either sent to you, deposited in a bank account or reinvested into the company stock.

Yes, you can sell any time, assuming this is common stock that you own in a publically traded corporation. Dividends are sent to owner's of record as of the "ex-dividend" date each quarter - and where it goes depends on how your stock holding is set up. If you have a physical stock certificate in your possession then the dividend is sent directly to you, via US mail unless you have set up a direct deposit arrangement with the company's transfer agent, or as already noted if you have an automatic dividend reinvestment plan set up (but I doubt that's the case or you would probably not be asking this question). If the stock is booked into your brokerage account i.e. (it's held in "street name"), then dividends are deposited directly into your brokerage account - this is the most common way that individual's hold stock in accounts at brokers like E-Trade, Schwab, Vanguard, Fidelity, Merrill Lynch, etc.