Making use of trading signal group is just like you looking digging your own grave or eating something you know will affect your body system and you'll be better just by improving your knowledge in crypto trading but you have to start with a coin like Bitcoin.
I believe you are right! It is better to improve yourself than to blindly trust someone else, money is at stake, it is not wise to trust strangers with your money! So it is better to trade with your knowledge, and using these signals can be like checking what others think and their view of the current market situation!
And definitely, it's best to start with Bitcoin and not move far away from trading Bitcoin!