LONDON -- In Motley Fool UK's first video in our "Ask a Foolish Question" series, resident expert David Kuo gives TMF editor Sam Robson a fruitful answer to his question about when the right time is to sell shares from a portfolio. David lists three main reasons, citing the importance of having a purpose for the investments -- simply click the following link to find out what they are.

If you want to learn more about shares but aren't sure where to start, then download our latest free guide, "What Every New Investor Needs To Know". You can also send any questions you'd like answered to foolishquestions@fool.co.uk.