Re: anchoring at sea
Fit a depth sounder to your boat.
Learn about tides/tidal range - especially in your chosen anchoring area.
Make sure you have plenty of 'scope' when you anchor, including a decent length of chain - not just rope. The weight of the chain helps keep the anchor in the correct position to get a good amount of purchase on the sea bed.
The anchor will prove useless unless it has a good grip on the sea bed. It's this grip that holds the boat in position against the tide/wind.
Read some online articles on anchoring - as already supplied on this thread.
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