Roast chicken and beef tenderloin are relatively simple to prepare as a main. One challenge is seasoning correctly, so taste before serving.
Food should taste great, but entertaining can be more about appearance. Roasted vegetables are easy. Colorful vegetables, or even fingerling potatoes go a long way to make a dish feel unique. An artisan pasta is also easy. Baguette with different spreads can make a colorful display. Salads are also easy.
A nice flourless chocolate cake or assortment of berries with ice cream for dessert.
I would resist the need to impress. Simple is often best if you haven't practiced a dish.
I've found Donna Hay has many simple dishes for entertaining. The choices can feel overwhelming, and there are more involved dishes. You might get ideas from her though.
https://www.donnahay.com.au/recipes/entertaining/