Boring greenhouse question

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I'm a very new and tentative gardener but love growing things from seed. I don't have money for a proper greenhouse right now. Are the polythene ones good? I have a part of my garden that is shady (south facing but under a big tree)
Will the greenhouse be ok here ? Does it need to be in direct sunlight?

Make sure its pinned down properly, those things are a nightmare in abit of wind. If you check Facebook people give them away quite often, I got mine for free ☺️

They're better than not having a greenhouse.
Try & put it where it will get sunlight for at least part of the day.

Home grown tomatoes are easy & taste so good. They'll do well in one of those greenhouses but need sun.

I have two greenhouses in my garden. I bought a slim one last year, and a 6 foot long one with four shelves this year. I have heaps of seeds sown. Whether anything comes of them remains to be seen but it’s an experiment. They are not glass ones but the green fabric plastic ones which are brilliant. I grew tomatoes, rosemary, lavender and irises last year. This year, I have heaps like basil, courgettes, squash, peas, lettuce, sunflowers, and lots of flowers. Whether they will grow remains to be seen. I also have potatoes, red onions, carrots on the go, and fruit bushes planted last year like blueberries, yellow raspberries and blackcurrants. I seem to be better at growing from bulbs than seeds. I think it’s the soil we have here. It’s rubbish.