First Road Bike Recommendation

Very much so. Decathlon bikes are good value for what they are. My first road bike was a B’twin Triban 500 from Decathlon and it made me fall in love with the sport. I still have that bike in my home country and use it for visits. If you’re wanting to do off-road/gravel rides as well then maybe not (get something with wider tyre clearance and disk breaks in that case, Decathlon also offer those) , but it’s a perfectly good bike for road! Shimano 105 is a great groupset too.