Tipping in bars and clubs • English Conversation Questions

What is the standard percentage for tipping in bars and clubs?
Do you tip the bartender or the server in a club?
Is it customary to tip the DJ in a club?
Do you tip the bar staff for drinks served at your table in a club?
Should you tip more if you received exceptional service at a bar or club?
Is it acceptable to tip with a credit card or should you tip in cash?
What is the etiquette for tipping in a crowded bar or club?
Should you tip the bartenders or servers if they’ve made a mistake with your order?
How much should you tip for bottle service at a club?
Is it polite to tip the bouncer at a club?
Do different countries have different customs for tipping in bars and clubs?