Q.Summer squash and cucumbers
I planted two rows of yellow summer squash and two rows of cucumber. I got 4 rows of cucumbers and no yellow squash. What did I do wrong?

They can take up to two weeks to germinate. If it has been longer than this, then there are a few things that could be wrong. The temperature could be too low for germination, or it could be too wet. It is common for the seed to rot out if it remains too wet for too long.
Here are two articles that will help: https://www.gardeningknowhow.com/edible/vegetables/cucumber/tips-for-growing-cucumbers.htm
https://www.gardeningknowhow.com/edible/vegetables/squash/how-to-grow-summer-squash.htm