This popped up in my garden, it's a tree or shrub because of the woody-like stem..I have no idea what it could be..

Given where you garden, I wonder if it might be European beech (Fagus sylvatica)?

Reminds me of Chestnut.

Thanks for the replies!
I also thought for a moment Rob, it could be European Beech but it isn't, I do have another volunteer which is a Fagus sylvatica purpurea, the purple leaved variety and when comparing the two they don't match..
I think the Sweet Chestnut (Castanea sativa) is correct Leslieray, the shape of the leaves and the arrangement of the veins do match !
No idea how it ended up in my garden though..the seed is large and could not have been carried by birds and I haven't eaten nor bought those for many years..

Here there moved around by Jays that plant them and other nuts including pecans, walnuts, chestnuts, and tons of acorns then forget them. There gardening ideas make for a lot of work removing seed/saplings which can be tough if they get growing for a while before you fined them. Most chestnuts that fall are eaten by one critter or another including me. They make a delicious soup!

Ah that makes sense, I often do have Jays for visitors in the garden!
I love Chestnuts, used to eat a lot when I was young, they are also nice roasted in the fire like potatoes!
The tree is beautiful too, but unfortunately i have no room for it in my little town garden..