In this type of particular situation where a person is just getting started, people usually prefer a centralized trading platform that provides a variety of facilities to the newbies such as P2P trading, Direct crypto buying using local money, Basic trading view, and Pro trading view, easy swaps, and profile-based wallet address for all those listed projects on that particular platform.

On the other hand in decentralized wallets, you need to pay extra fees and also need to manage all of your requirements and funds on your own. I decentralized wallets Hot wallets are particularly used for trading purposes. You can use Trust wallet, Meta Mask and Electrum as well for trading purposes and temporary hold of your funds. 

There are pros and cons in both;

• Centralized wallets/platforms provide facilities but in Decentralized wallets and platforms you need to do all on your own
• Centralized wallets are more likely easy to handle and use but in a Decentralized wallet you need to be careful because you are responsible for security
• Decentralized wallets and platforms provide self-custody of funds, centralized wallets (remember not your key, not your funds) do not provide self-custody
• Decentralized wallets/platforms give priority to your privacy but centralized platforms invade your privacy and control all of your activity at their own
• Much more you can learn by searching Decentralized vs Centralized and you'll know whatever you need but for a complete beginner as your intention is just trading I will prefer Centralized exchanges because from there you can learn and when you got experience and enough funds then you can switch to decentralization but prefer most reputed platforms in both categories.