Welcome aboard. 
This thread on SMART intervals should provide some insight –
SMART workout rest duration - Support - Xert Community Forum (xertonline.com)
Smart Intervals in Xert can have one or more of these meanings:
1. A smart interval can have specific power targets calculated for each athlete based on their Fitness Signature
2. A smart interval can have dynamic interval duration,
3. A smart interval can have dynamic power during the interval.
Dynamic duration intervals (work and rest) will shorten/lengthen depending on how closely you hit targets.
Dynamic power intervals will feel like wavering surges depending how closely you maintain target watts.
Other types are tied specifically to your fitness signature at the moment.
One thing to keep in mind is exporting a SMART workout (to run elsewhere) removes any SMART attributes and converts the workout to old-school %FTP blocks. XSS results will be similar but to retain all the benefits you’ll want to use a Xert workout player…
Many of us do not populate the Planner more than a week in advance (if at all). That is something to get used to coming from a platform that relies on a pre-populated calendar. You won’t fully appreciate how much better Xert’s “flex plan” method works until you’ve experienced training that way over a year. You can dial things up or down day-to-day and week-to- week depending on your schedule and how well you are handing the training load and intensity.
Take a look at the Planner and note the calculated freshness (ex. yellow, blue, green) as that reflects what will be recommended on those days if your freshness matches.
If you adjust the freshness slider (because you recover more or less quickly than the predictions) the recommend workout list will change accordingly.
You might consider using the Continuous option until ready to set your TED and when you do that adjust the date to start in Build depending on your progression level at that point in the year.
You are in charge of rest days (allocate your weekly hours) and recovery weeks (ex. adjust IR down for a week) but realize with Xert that you can potentially train continuously by moderating TL and intensity rather than following the old-school 3/1 pattern of specific weekly workouts followed by a recovery week.
Xert is hybrid polarized model which will feel easier than SSB/SST, but you can select more SS workouts if you are time crunched and respond well to that approach. But if you can handle more hours per week most cyclists experience longer-term benefits from accumulating polar/pyramid endurance hours. (Getting faster/fitter by going slower over time.)
Base phase has an endurance focus. Higher intensity workouts won’t come into play until latter half of build and especially when freshness goes to blue/green and you’re up to 3 stars or higher. However, you can jump the gun whenever you’re up for it and tackle something harder (Load More list will have more variety or use the Filter options).
You are also in charge of selecting a BT workout on occasion if your signature goes stale and your outdoor rides aren’t generating any BT events.
BTW: My first/last name under XO, Account Setting is Ridge/Rider2. 
Other useful threads/articles –
Fitnes planner suggesting same workout constantly - Support - Xert Community Forum (xertonline.com)
Beginner questions - Support - Xert Community Forum (xertonline.com)
Fitness Improvement and Day-to-day Variation – Xert (baronbiosys.com)