Heh, having had a full long-rest refresh.
The Character Advancement Table for leveling can schedule:
Race and Background
Level 0
Feats
Levels 0 (Background), 4, 8, 12, 16, and 20 19
Boons
Levels 20 and up
Subclass Features
Levels 1, 2, 6, 10, 14, and 18
Class Features
Levels 1 (x4), 3, 5, 7, 9, 11, 13, 15, and 17
Note, the Warrior classes can use a class level for a Warrior feat. The third casters like Eldritch Knight and Trickster instead gain their spells at Subclass levels, unlike the full and half casters that gain their spells at Class levels.
Level 1
Level 1 has a design space of about 5 feats: Simple Combat, Class Saves, Subclass Features, and a 2-feat space for Class Features.
SIMPLE COMBAT
• d8 Hit Die (improves from d6)
• All Simple Weapons
• Light Armor
Note, the Wizard irregularly swaps out the Simple Combat design space for more magic. Because the Wizard can fight with cantrips, I suggest the Wizard class doesnt even get Simple Weapons. However, a Wizard player can optionally choose to swap out a cantrip to gain: either All Simple Weapons or Light Armor. Narratively, the character showed an aptitude for magic at a young age, and while other teens were training for defense with armory, these Wizard apprentices were training separately for defense with magic. But a few individuals got a smattering of armory training, before dedicating themselves to magic training.
CLASS SAVES
• "Strong" Save
• "Weak" Save
SUBCLASS FEATURES
• A design space of about one feat to establish the subclass.
Note, each class will recommend a specific subclass. For example, the default Fighter is a Champion, the default Rogue is a Thief, the default Wizard is an elemental Evoker. Make sure the flavor for the default subclass is described separately from base class. More experienced players can choose whichever subclass they want.
Where the Eldritch Knight and Trickster only gain spells at the subclass levels, the schedule is as follows: level 1 (2x 1st Slot), level 2 (1st Slot), level6 (1st Slot, 2x 2nd Slot), level 10 (2nd Slot, 2x 3rd Slot), level 14 (3rd Slot), level 18 (4th Slot).
CLASS FEATURES
• A design space of about two feats to establishes the base class.
With three feats of design space being spent on Simple Combat, Class Saves, and Subclass Features, there are about two feats remaining to establish the Class Features.
For example, Warrior classes will use the design space for advanced combat, such as better Hit Die, Medium Armor, Martial Weapons, plus combat features that are distinctive to the class. The Rogue Class uses the design space for Sneak Attack with almost a half feat left over for other Rogue features.
It is useful and easy to establish Subclass features at level 1, as part of an overall Character Advancement Table that schedules the various features that each character gains while leveling.