Question about my net worth

Spanish guy here that lives in Ireland for 6 years. I gonna start investing and this things always throw me off a lot, I gonna use Revolut because already been using for a while so why not for invest I guess.

They are asking me for the total value of my assets.

I have half house an a car in Spain on my name, I do not use it right now but yeah is on my name.

For legal reasons I guess I suppose to put the value of this things as well? and for calculate the value I need a properly done or I can just eyeballing.

I know it sounds stupid but is my first step in this world and everything is kinda to much.