@DimitrisLodirogas in my initial days I used to visit this section and read other members guides, later on I started using google to search and understand what was not covered here. According to me you’ll find everything detailed out here, and you should begin reading the guides mentioned here before you use other platforms.
Avoid those people that are suspicious and will ask you to deposit any amount for a too good to be true return, I guess you have to be aware of those scams.
In addition to @jossiel suggestion I would recommend you to use Electrum wallet as that’s beginner friendly, and yea be careful of online scams do your own due diligence before you send funds to anyone using bitcoins.