The frontside boardslide is what I would call a basic slide trick, but can be very intimidating to learn, as you are blind to the way you are facing.
Description: The skater approaches a slideable object frontside, ollies 90° backside and lands on the object with the centre of the board in a boardslide. The skaterís back is facing the way they are moving.
You probably want to be comfortable with ollies, maybe even b/s 180s (I wasnít but it might help nonetheless) before trying this trick. However the main thing you need is good timing and of course, balance.
I think these are probably easily learnt on a low flatbar - not low enough to just pivot onto but not high enough to rack yourself on either. So go find something like that, a waxed up double-sided ledge or curb should do finely.
Approach whatever youíre gonna frontside boardslide totally parallel (not on an angle at all) with your feet in regular ollie position. You can even put your front foot up a bit further if you want extra-good control, just do what feels best for you. Also make sure your legs are bent throughout the whole movement, from approach to landing.
Now is when timing comes in. You need to pop your tail and level out over the obstacle, and come down lightly, not hard, with your board and weight centred. It might even help to keep a rhythm to what your doing, I found that helped me from freaking out and bailing. However the key to getting a nice clean slide comes from your body positioning.
When you pop, only turn the lower half of your body. This will get the board 90° with your feet on it. Now this is important - you need to have your upper body twisted so you can get you head over your leading shoulder (left for regulars) to see where youíre going. The point of this isnít actually just to see where youíre going, it actually gives you a lot better balance during the slide, making it longer and a hellava lot smoother. It also allows you to come out regular, rather than fakie.
You might be thinking now - OK I can get onto the rail fine, but how can I stop slipping out and landing on my face? This is the part where balance plays a key role. Depending on your speed and the butter factor or the object your sliding, you need to take your previously centred weight and shift it backwards or forwards. If you keep sticking and falling onto your back it means youíre leaning back too much - likewise if you keep smashing your head open your leaning too far forward. You really have to judge this for each different obstacle, Ďcos they are all different.
If youíve kept your head over your leading shoulder, you should really automatically turn back into your regular stance when you come off the end of the obstacle your using, which personally I find easier than coming out fakie. To come out fakie you have to swing your body around with your legs when you pop, so you canít see at all where youíre going, which can be intimidating.
Make sure you practice this one a lot - it doesnít come easy to everyone but it is learnable and most of all fun (and personally I reckon itís sicker than the backside version).