Some F1 varieties are fine, but many now appearing in seed catalogues are commercial varieties, as opposed to garden varieties, which may not suit what you want out of a plant.
Commercial peas for instance are bred to be short stemmed and to have all the pods ripe at the same time. That way they can harvest them all with a machine. If you grow these at home you will get a glut for a week and then nothing, plus taste is way down the list of desirable traits.
Carrots are bred for strong stems, so that a machine can pull them out of the ground, tomatoes for their storage potential between harvesting and several days on a supermarket shelf (the same goes for strawberries), taste again is not much of a criteria.
Yes you can save seed from F1 plants, they then become F2. They won't be the same as the original of course, but most should be broadly similar.
Like Maggie I saved seed from a supermarket tomato. It came pretty true for several years, but this year it's not doing well. The problem is of course I have no idea what the name of the original was, so I can never replace it.
Not a stupid question at all.
