For the top menu try this Wayfinder call:
[[!Wayfinder? &startId=`0` &level=`1`]]
(assumed that your homepage has id = 0 ). The parameter &level=`1` restricts the output to just one level, so you won't see any submenus here.
For the side menu you need an own Wayfinder call - try this one:
[[!Wayfinder? &startId=`[[*id]]` &hideSubMenus=`1`]]
Using
this menu displays the children of the actual page.
Try the effect of changing &hideSubMenus=`1` to &hideSubMenus=`0`.
Good luck - and welcome to MODX!