Approaching ( a boat, dock, whatever)
Coming into the current usually provides the most control, though be ready to get a spring line ashore if the wind is stiff and opposing the current.

Lay of the line
To avoid tangling with the wrap (line) of a pot float, run past it on its up-current side.  Hope for a good running current–it makes it easier to tell which direction the line from the buoy leads. Slack water is tougher to read.

Leaving a slip
In a cross-current, remove the down-current lines first, On the current side, I release the spring lines first, then I let the stern line go, letting the boat rest against the down-current pole.  Finally, remove the bow line and back your boat out.

Set
Even with a GPS, point your bow a degree or two up-current oof your course.  Because a GPS give you a great circle routing, you’ll end up steering a straighter, more fuel-efficient course.

Backing against current
You’ll need to use throttle, so practice backing into a current out in a channel to see how much power you need and how your boat reacts at different levels of thrust.  Also, having a spring line cleated off, ready to be taken ashore to hold you, because as soon as yoou let off the throttle, you’re going to get pushed back out.

Backing with current
Same as above. Practice “stemming” in open water so you know how your boat reacts.  Let off the throttle earlier and be ready with a spring line.

Wind
When the current opposes the wind, a rip is created.  In a bay it’s a ripple, but in open water rips can be big, steep, close-together waves. Get local knowledge from other boaters or current tables from such references as Eldrige Tide and Pilot.  Perhaps rounding the far side of an island is better than taking the shorter course between it and the mainland.

Head to Wind?
If the wind opposes the current, the rope may end up under the boat when you drop the hook, where it could snag your props.  In this situation, drift a bit before dropping anchor to see which way the boat will go.

Time Games
Be aware that current continues to flow after the tide has reached its full  height or ebb.  Current flows fastest new the middle of a tide and peters out following ebb and flood.