Know thine enemy!

[DWSmith]

What is a good way to learn to identify weeds?

[veggiechicken]

Start by learning to identify plants from a good field guide.
Not all the plants will be weeds and not all "weeds" are undesirable. To me a "weed" is any plant growing in the wrong place that can't be found a home somewhere else in the garden.

[Guest]

Pay attention and don't be too quick to pull them up Books and searching the net when they pop up is good and when you get really stuck take a pic and ask on here. Even paying attention to roots when you dig over soil helps.

[happyhumph]

If you have friends or neighbours who are keen gardeners in your area ask them to show you what weeds they have to deal with - will give you an idea what ones are prominent in your area

[KevinM67]

Build a wall - and get the weed to pay for it.

[Nicos]

There are loads and loads of sites on t'internet showing seedlings of 'weeds'.
You will have a very small proportion of those depending on your soil type, location and micro climate

Always a good place to start looking