i have a problem with my lasso tool

i was watching a tutorial and making my first project (i'm new), and I've encountered this problem, my lasso tool keeps getting messed up and i don't know how to fix it, it is supposed that when i select something the tool looks like a square

but it looks like this when i try to use it

.

please help me as i am new to blender and its really bugging me how its changing every time , i am not sure if i have pressed any button which is a shortcut to change a setting or something like that.

thank you.

• The shortcut to cycle between the selection types is W. Maybe you pressed it by error ? In previous Blender versions this was mapped to a menu and older tutorials use it. Apr 29 '20 at 13:39
• i might have been, thanks anyways mate, much apretiated. Apr 29 '20 at 14:29