Keep equipment clean. Coffee oils become rancid if left to linger.
Weigh your coffee using a gram scale. There are several inexpensive options.
If using a paper filter, rinse thoroughly to minimize papery taste.
The strength of a cup of coffee is a result of how you brew, not something inherent to a coffee.
Your grinder is your most important brewing device. Invest in a burr grinder - there are affordable options. Consistent grind size is key to quality extraction. Blade grinders are for nuts and seeds, never coffee.
Keep your equipment clean, coffee oils go rancid over time.
Drink fresh coffee. Buy beans roasted in the past seven days.
Siphon / Vac Pot