question

>>Leaderboard: three types of scores

PlayFab allows you to create 300 types of statistics for players and each statistics represent a leaderboard. You can refer to Tournaments & Leaderboards quickstart - PlayFab | Microsoft Learn to have more information about Leaderboard.

>>tables Missions

What does the “table Missions” mean? Currently, PlayFab does not provide the mission feature, but you may implement the mission system by yourself. You may first set up your missions in Title Data, store the mission's name, mission completion conditions and mission rewards as JSON object. Please note that title data is suitable for storing global constant/static data. So, it’s not suitable for storing the player’s mission progress. You may use Azure Functions to update mission progress into User Read Only Data. You can check for completion and grant rewards in an Azure Function too.

>>achievements Cloud saving

PlayFab provide Player Data feature for you to store data for players, the achievements can be stored in User Read Only Data.

>>authentication In game purchases ie score, coins etc

PlayFab provides tutorials on how to set up In-App Purchasing (IAP) using PlayFab, the Unity + IAP Service, and the Android Billing API. For EconomyV2, you can refer to Getting started with Economy v2, Unity IAP, and Android - PlayFab | Microsoft Learn. For Economy V1, you can refer to Getting started with PlayFab Economy (Legacy), Unity IAP, and Android - PlayFab | Microsoft Learn. Also, Playfab support virtual currency purchase. For Economy V2, PlayFab provides APIs for players to buy catalog items with virtual currency, you can refer to Items and Inventory Overview - PlayFab | Microsoft Learn. For Economy V1, you may refer to Items (Legacy Economy) quickstart - PlayFab | Microsoft Learn.

>> User sharing on socials to win items

PlayFab doesn’t directly provide a feature for social sharing, but it supports integration with social platforms like Facebook. And you may need to implement social sharing functionality yourself.

>> Also is it relatively easy for a nub like me to install and potentially use cross platform later ie pc, web etc?

As for ease of use and cross-platform support, PlayFab is designed to be developer-friendly and has extensive documentation and community support to help you get started. It also provides SDKs for various platforms including Unity, making it more convenient for cross-platform use. And if you have any questions while using PlayFab features, you can always post your questions to this forum to get professional help.