I prefer baby powder to deodorant. Deodorant clogs your pores while baby (talcum) powder soaks up moisture. Much cheaper too!

Protip: put on deodorant before shirt.

(Also, get an antiperspirant/deodorant (without aluminium/titanium if possible)).

Why is this a protip? What does putting it on before or after putting a shirt on do? Sounds like personal opinion, and not a clever technique to accomplish an old task.

invisible already stated that a dark shirt and white non-gel type deodorant will most likely result in a rather embarrassing slash down the side of your shirt. One that I have been a victim of more than once. Seems like a good enough reason to get in the habit of applying it after putting on your shirt.

I smell an A/B test.

Pun not intended?

Do not put on deodorant before shirt if deodorant is white or else you will regret it one day when you're marked with a "slash" of deodorant.

Don't forget new underwear ... you would think it wouldn't need to be said