this tips and tricks video seems alittle outdated for the current build of the game due to the look of the jaber's delivery area

yellow star is shop rating. For every item you sell you get 1 point and for every item a customer tries to buy but you don't have you get -3 points. So if you sell 4 items and then miss 1 you will slowly increase it. If you carry everything you will quickly reach max. It doesn't do much except if you have a 50% bar you are allowed to buy electronics. Buying electronics can make a lot of profit per item however careful I have had multiple super expensive electronics (Fridges, TVs, Oven) that would not sell for many WEEKS! So electronics are super longterm investment for endgame only. As for the guide it's a bit outdated since several mechanics are now different. For example you now have to sleep in order to pass the next day to get rotating stock prices and make things like companies and farm generate money.

what does the yellow star mean?
how do i full it??

can you make your shop bigger

check your laptop for the auto open store at 7 am

Yeh, someone else mentioned that as well - but its not just on your hood, you can put them on your roof as well

Have another tip I found you can also store boxes on your hood . I put them over my fenders so I can see to drive. you can get at least 4.