Polytunnel for beginner

salad crops are good , carrots for small types  sweet corn , pepers ,  cucumbers , toms ,melons . spring oinons , just a few of what im grow in main just remember you must water it well as it gets no rain

Looking at getting a smallish one 10ft by 20ft – 24ft

Not sure that qualifies as "small"

I have a 30' x 10' cropping greenhouse.  I grow 3 or 4 batches of Sweetcorn down one side aimed to finish as the outdoor corn starts to come ripe.  I also plant some dwarf French beans (to crop until the outdoor Runners take over).

At the far end I grow 3 Cucumbers, and down the other side Tomatoes, Melons, Aubergines and Sweet Peppers.  I grow a few more Aubergines, Peppers (including some Chillies) and Melons in large pots to plant out as the Corn finishes (the plant spacing of the corn has evolved over the years to allow me to plant the other in between before the corn is actually finished )

In the Autumn I plant Winter Lettuce, Swiss Chard, Kohl Rabi and Beetroot for an early Spring crop.  (a Winter variety of Carrots would be OK too).

I also grow very early Potatoes in bags / containers (they get moved outside once frost danger is past and the greenhouse is getting too hot for them) and again the first week of August for an Christmas crop.

Thanks for all the comments/. Very helpful